diff --git a/Makefile b/Makefile
index 7900fa869dc..77a98f2871b 100644
--- a/Makefile
+++ b/Makefile
@@ -14,51 +14,38 @@ all:
 	$(MAKE) build
 
 build-proto: restore
-	MONO_ENV_OPTIONS=$(monoopts) $(XBUILD) /p:Configuration=Proto /p:TargetFramework=$(TargetFramework) src/fsharp/FSharp.Build-proto/FSharp.Build-proto.fsproj
-	MONO_ENV_OPTIONS=$(monoopts) $(XBUILD) /p:Configuration=Proto /p:TargetFramework=$(TargetFramework) src/fsharp/Fsc-proto/Fsc-proto.fsproj
+	MONO_ENV_OPTIONS=$(monoopts) $(MSBUILD) /p:Configuration=Proto /p:TargetDotnetProfile=$(TargetDotnetProfile) src/fsharp/FSharp.Build-proto/FSharp.Build-proto.fsproj
+	MONO_ENV_OPTIONS=$(monoopts) $(MSBUILD) /p:Configuration=Proto /p:TargetDotnetProfile=$(TargetDotnetProfile) src/fsharp/Fsc-proto/Fsc-proto.fsproj
 
 # The main targets
 build:
-	MONO_ENV_OPTIONS=$(monoopts) $(XBUILD) /p:Configuration=$(Configuration) /p:TargetFramework=net40 src/fsharp/FSharp.Core/FSharp.Core.fsproj
-	MONO_ENV_OPTIONS=$(monoopts) $(XBUILD) /p:Configuration=$(Configuration) /p:TargetFramework=net40 src/fsharp/FSharp.Build/FSharp.Build.fsproj
-	MONO_ENV_OPTIONS=$(monoopts) $(XBUILD) /p:Configuration=$(Configuration) /p:TargetFramework=net40 src/fsharp/FSharp.Compiler.Private/FSharp.Compiler.Private.fsproj
-	MONO_ENV_OPTIONS=$(monoopts) $(XBUILD) /p:Configuration=$(Configuration) /p:TargetFramework=net40 src/fsharp/Fsc/Fsc.fsproj
-	MONO_ENV_OPTIONS=$(monoopts) $(XBUILD) /p:Configuration=$(Configuration) /p:TargetFramework=net40 src/fsharp/FSharp.Compiler.Interactive.Settings/FSharp.Compiler.Interactive.Settings.fsproj
-	MONO_ENV_OPTIONS=$(monoopts) $(XBUILD) /p:Configuration=$(Configuration) /p:TargetFramework=net40 src/fsharp/FSharp.Compiler.Server.Shared/FSharp.Compiler.Server.Shared.fsproj
-	MONO_ENV_OPTIONS=$(monoopts) $(XBUILD) /p:Configuration=$(Configuration) /p:TargetFramework=net40 src/fsharp/fsi/Fsi.fsproj
-	MONO_ENV_OPTIONS=$(monoopts) $(XBUILD) /p:Configuration=$(Configuration) /p:TargetFramework=net40 src/fsharp/fsiAnyCpu/FsiAnyCPU.fsproj
-	MONO_ENV_OPTIONS=$(monoopts) $(XBUILD) /p:Configuration=$(Configuration) /p:TargetFramework=net40 src/fsharp/FSharp.Core.Unittests/FSharp.Core.Unittests.fsproj
-	MONO_ENV_OPTIONS=$(monoopts) $(XBUILD) /p:Configuration=$(Configuration) /p:TargetFramework=net40 /p:FSharpCoreBackVersion=3.0 src/fsharp/FSharp.Core/FSharp.Core.fsproj
-	MONO_ENV_OPTIONS=$(monoopts) $(XBUILD) /p:Configuration=$(Configuration) /p:TargetFramework=net40 /p:FSharpCoreBackVersion=3.1 src/fsharp/FSharp.Core/FSharp.Core.fsproj
-	MONO_ENV_OPTIONS=$(monoopts) $(XBUILD) /p:Configuration=$(Configuration) /p:TargetFramework=net40 /p:FSharpCoreBackVersion=4.0 src/fsharp/FSharp.Core/FSharp.Core.fsproj
-	$(MAKE) -C mono/policy.2.0.FSharp.Core TargetFramework=net40 $@
-	$(MAKE) -C mono/policy.2.3.FSharp.Core TargetFramework=net40 $@
-	$(MAKE) -C mono/policy.3.3.FSharp.Core TargetFramework=net40 $@
-	$(MAKE) -C mono/policy.3.7.FSharp.Core TargetFramework=net40 $@
-	$(MAKE) -C mono/policy.3.47.FSharp.Core TargetFramework=net40 $@
-	$(MAKE) -C mono/policy.3.78.FSharp.Core TargetFramework=net40 $@
-	$(MAKE) -C mono/policy.3.259.FSharp.Core TargetFramework=net40 $@
-	$(MAKE) -C mono/policy.4.0.FSharp.Core TargetFramework=net40 $@
-	$(MAKE) -C mono/policy.4.3.FSharp.Core TargetFramework=net40 $@
-	$(MAKE) -C mono/policy.4.4.FSharp.Core TargetFramework=net40 $@
-ifeq ("$(pclenabled47)", "yes")
-	MONO_ENV_OPTIONS=$(monoopts) $(XBUILD) /p:Configuration=$(Configuration) /p:TargetFramework=portable47 src/fsharp/FSharp.Core/FSharp.Core.fsproj
-endif
-ifeq ("$(pclenabled7)", "yes")
-	MONO_ENV_OPTIONS=$(monoopts) $(XBUILD) /p:Configuration=$(Configuration) /p:TargetFramework=portable7 src/fsharp/FSharp.Core/FSharp.Core.fsproj
-endif
-ifeq ("$(pclenabled78)", "yes")
-	MONO_ENV_OPTIONS=$(monoopts) $(XBUILD) /p:Configuration=$(Configuration) /p:TargetFramework=portable78 src/fsharp/FSharp.Core/FSharp.Core.fsproj
-endif
-ifeq ("$(pclenabled259)", "yes")
-	MONO_ENV_OPTIONS=$(monoopts) $(XBUILD) /p:Configuration=$(Configuration) /p:TargetFramework=portable259 src/fsharp/FSharp.Core/FSharp.Core.fsproj
-endif
-ifeq ("$(monodroidenabled)", "yes")
-	MONO_ENV_OPTIONS=$(monoopts) $(XBUILD) /p:Configuration=$(Configuration) /p:TargetFramework=monoandroid10+monotouch10+xamarinios10 src/fsharp/FSharp.Core/FSharp.Core.fsproj
-endif
-ifeq ("$(xamarinmacenabled)", "yes")
-	MONO_ENV_OPTIONS=$(monoopts) $(XBUILD) /p:Configuration=$(Configuration) /p:TargetFramework=xamarinmacmobile src/fsharp/FSharp.Core/FSharp.Core.fsproj
-endif
+	MONO_ENV_OPTIONS=$(monoopts) $(MSBUILD) /p:Configuration=$(Configuration) /p:TargetDotnetProfile=net40 src/fsharp/FSharp.Core/FSharp.Core.fsproj
+	MONO_ENV_OPTIONS=$(monoopts) $(MSBUILD) /p:Configuration=$(Configuration) /p:TargetDotnetProfile=net40 src/fsharp/FSharp.Build/FSharp.Build.fsproj
+	MONO_ENV_OPTIONS=$(monoopts) $(MSBUILD) /p:Configuration=$(Configuration) /p:TargetDotnetProfile=net40 src/fsharp/FSharp.Compiler.Private/FSharp.Compiler.Private.fsproj
+	MONO_ENV_OPTIONS=$(monoopts) $(MSBUILD) /p:Configuration=$(Configuration) /p:TargetDotnetProfile=net40 src/fsharp/Fsc/Fsc.fsproj
+	MONO_ENV_OPTIONS=$(monoopts) $(MSBUILD) /p:Configuration=$(Configuration) /p:TargetDotnetProfile=net40 src/fsharp/FSharp.Compiler.Interactive.Settings/FSharp.Compiler.Interactive.Settings.fsproj
+	MONO_ENV_OPTIONS=$(monoopts) $(MSBUILD) /p:Configuration=$(Configuration) /p:TargetDotnetProfile=net40 src/fsharp/FSharp.Compiler.Server.Shared/FSharp.Compiler.Server.Shared.fsproj
+	MONO_ENV_OPTIONS=$(monoopts) $(MSBUILD) /p:Configuration=$(Configuration) /p:TargetDotnetProfile=net40 src/fsharp/fsi/Fsi.fsproj
+	MONO_ENV_OPTIONS=$(monoopts) $(MSBUILD) /p:Configuration=$(Configuration) /p:TargetDotnetProfile=net40 src/fsharp/fsiAnyCpu/FsiAnyCPU.fsproj
+	MONO_ENV_OPTIONS=$(monoopts) $(MSBUILD) /p:Configuration=$(Configuration) /p:TargetDotnetProfile=net40 src/fsharp/FSharp.Core.Unittests/FSharp.Core.Unittests.fsproj
+	mkdir -p $(Configuration)/fsharp30/net40/bin
+	mkdir -p $(Configuration)/fsharp31/net40/bin
+	mkdir -p $(Configuration)/fsharp40/net40/bin
+	cp -p packages/FSharp.Core.3.0.2/lib/net40/* $(Configuration)/fsharp30/net40/bin
+	cp -p packages/FSharp.Core.3.1.2.5/lib/net40/* $(Configuration)/fsharp31/net40/bin
+	cp -p packages/FSharp.Core.4.0.0.1/lib/net40/* $(Configuration)/fsharp40/net40/bin
+	mkdir -p $(Configuration)/portable7/bin
+	cp -p packages/FSharp.Core.4.1.17/lib/portable-net45+netcore45/* $(Configuration)/portable7/bin
+	mkdir -p $(Configuration)/portable47/bin
+	cp -p packages/FSharp.Core.4.1.17/lib/portable-net45+sl5+netcore45/* $(Configuration)/portable47/bin
+	mkdir -p $(Configuration)/portable78/bin
+	cp -p packages/FSharp.Core.4.1.17/lib/portable-net45+netcore45+wp8/* $(Configuration)/portable78/bin
+	mkdir -p $(Configuration)/portable259/bin
+	cp -p packages/FSharp.Core.4.1.17/lib/portable-net45+netcore45+wpa81+wp8/* $(Configuration)/portable259/bin
+	mkdir -p $(Configuration)/monoandroid10+monotouch10+xamarinios10/bin
+	cp -p packages/FSharp.Core.4.1.17/lib/portable-net45+monoandroid10+monotouch10+xamarinios10/* $(Configuration)/monoandroid10+monotouch10+xamarinios10/bin
+	mkdir -p $(Configuration)/xamarinmacmobile/bin
+	cp -p packages/FSharp.Core.4.1.17/lib/xamarinmac20/* $(Configuration)/xamarinmacmobile/bin
 
 
 
@@ -66,14 +53,12 @@ install:
 	-rm -fr $(DESTDIR)$(monodir)/fsharp
 	-rm -fr $(DESTDIR)$(monodir)/Microsoft\ F#
 	-rm -fr $(DESTDIR)$(monodir)/Microsoft\ SDKs/F#
-	-rm -fr $(DESTDIR)$(monodir)/gac/FSharp.Core
-	-rm -fr $(DESTDIR)$(monodir)/gac/FSharp.Compiler.Private
-	-rm -fr $(DESTDIR)$(monodir)/xbuild/Microsoft/VisualStudio/v/FSharp
-	-rm -fr $(DESTDIR)$(monodir)/xbuild/Microsoft/VisualStudio/v11.0/FSharp
-	-rm -fr $(DESTDIR)$(monodir)/xbuild/Microsoft/VisualStudio/v12.0/FSharp
-	-rm -fr $(DESTDIR)$(monodir)/xbuild/Microsoft/VisualStudio/v14.0/FSharp
-	-rm -fr $(DESTDIR)$(monodir)/xbuild/Microsoft/VisualStudio/v15.0/FSharp
-	$(MAKE) -C mono/FSharp.Core TargetFramework=net40 install
+	-rm -fr $(DESTDIR)$(monodir)/msbuild/Microsoft/VisualStudio/v/FSharp
+	-rm -fr $(DESTDIR)$(monodir)/msbuild/Microsoft/VisualStudio/v11.0/FSharp
+	-rm -fr $(DESTDIR)$(monodir)/msbuild/Microsoft/VisualStudio/v12.0/FSharp
+	-rm -fr $(DESTDIR)$(monodir)/msbuild/Microsoft/VisualStudio/v14.0/FSharp
+	-rm -fr $(DESTDIR)$(monodir)/msbuild/Microsoft/VisualStudio/v15.0/FSharp
+	$(MAKE) -C mono/FSharp.Core TargetDotnetProfile=net40 install
 	$(MAKE) -C mono/FSharp.Build install
 	$(MAKE) -C mono/FSharp.Compiler.Private install
 	$(MAKE) -C mono/Fsc install
@@ -81,39 +66,17 @@ install:
 	$(MAKE) -C mono/FSharp.Compiler.Server.Shared install
 	$(MAKE) -C mono/fsi install
 	$(MAKE) -C mono/fsiAnyCpu install
-	$(MAKE) -C mono/FSharp.Core TargetFramework=net40 FSharpCoreBackVersion=3.0 install
-	$(MAKE) -C mono/FSharp.Core TargetFramework=net40 FSharpCoreBackVersion=3.1 install
-	$(MAKE) -C mono/FSharp.Core TargetFramework=net40 FSharpCoreBackVersion=4.0 install
-	$(MAKE) -C mono/policy.2.0.FSharp.Core TargetFramework=net40 install
-	$(MAKE) -C mono/policy.2.3.FSharp.Core TargetFramework=net40 install
-	$(MAKE) -C mono/policy.3.3.FSharp.Core TargetFramework=net40 install
-	$(MAKE) -C mono/policy.3.7.FSharp.Core TargetFramework=net40 install
-	$(MAKE) -C mono/policy.3.47.FSharp.Core TargetFramework=net40 install
-	$(MAKE) -C mono/policy.3.78.FSharp.Core TargetFramework=net40 install
-	$(MAKE) -C mono/policy.3.259.FSharp.Core TargetFramework=net40 install
-	$(MAKE) -C mono/policy.4.0.FSharp.Core TargetFramework=net40 install
-	$(MAKE) -C mono/policy.4.3.FSharp.Core TargetFramework=net40 install
-	$(MAKE) -C mono/policy.4.4.FSharp.Core TargetFramework=net40 install
-ifeq ("$(pclenabled47)", "yes")
-	$(MAKE) -C mono/FSharp.Core TargetFramework=portable47 install
-endif
-ifeq ("$(pclenabled7)", "yes")
-	$(MAKE) -C mono/FSharp.Core TargetFramework=portable7 install
-endif
-ifeq ("$(pclenabled78)", "yes")
-	$(MAKE) -C mono/FSharp.Core TargetFramework=portable78 install
-endif
-ifeq ("$(pclenabled259)", "yes")
-	$(MAKE) -C mono/FSharp.Core TargetFramework=portable259 install
-endif
-ifeq ("$(monodroidenabled)", "yes")
-	$(MAKE) -C mono/FSharp.Core TargetFramework=monoandroid10+monotouch10+xamarinios10 install
-endif
-ifeq ("$(xamarinmacenabled)", "yes")
-	$(MAKE) -C mono/FSharp.Core TargetFramework=xamarinmacmobile install
-endif
+	$(MAKE) -C mono/FSharp.Core TargetDotnetProfile=net40 FSharpCoreBackVersion=3.0 install
+	$(MAKE) -C mono/FSharp.Core TargetDotnetProfile=net40 FSharpCoreBackVersion=3.1 install
+	$(MAKE) -C mono/FSharp.Core TargetDotnetProfile=net40 FSharpCoreBackVersion=4.0 install
+	$(MAKE) -C mono/FSharp.Core TargetDotnetProfile=portable47 install
+	$(MAKE) -C mono/FSharp.Core TargetDotnetProfile=portable7 install
+	$(MAKE) -C mono/FSharp.Core TargetDotnetProfile=portable78 install
+	$(MAKE) -C mono/FSharp.Core TargetDotnetProfile=portable259 install
+	$(MAKE) -C mono/FSharp.Core TargetDotnetProfile=monoandroid10+monotouch10+xamarinios10 install
+	$(MAKE) -C mono/FSharp.Core TargetDotnetProfile=xamarinmacmobile install
 	echo "------------------------------ INSTALLED FILES --------------"
-	ls -xlR $(DESTDIR)$(monodir)/fsharp $(DESTDIR)$(monodir)/xbuild $(DESTDIR)$(monodir)/gac/FSharp* $(DESTDIR)$(monodir)/Microsoft*
+	ls -xlR $(DESTDIR)$(monodir)/fsharp $(DESTDIR)$(monodir)/msbuild $(DESTDIR)$(monodir)/xbuild $(DESTDIR)$(monodir)/Reference\ Assemblies $(DESTDIR)$(monodir)/gac/FSharp* $(DESTDIR)$(monodir)/Microsoft* || true
 
 dist:
 	-rm -r fsharp-$(DISTVERSION) fsharp-$(DISTVERSION).tar.bz2
diff --git a/before_install.sh b/before_install.sh
index db4e9cbf672..d1498a55e64 100755
--- a/before_install.sh
+++ b/before_install.sh
@@ -58,7 +58,7 @@ fi)
 fi)
 
 #TODO: work out how to avoid the need for this
-chmod u+x packages/FSharp.Compiler.Tools.4.1.23/tools/fsi.exe 
+chmod u+x packages/FSharp.Compiler.Tools.4.1.27/tools/fsi.exe 
 chmod u+x packages/FsLexYacc.7.0.6/build/fslex.exe
 chmod u+x packages/FsLexYacc.7.0.6/build/fsyacc.exe
 
diff --git a/build.cmd b/build.cmd
index 04aef097d29..5624de77d8a 100644
--- a/build.cmd
+++ b/build.cmd
@@ -568,7 +568,7 @@ set _dotnet20exe=%~dp0Tools\dotnet20\dotnet.exe
 set NUGET_PACKAGES=%~dp0Packages
 set path=%~dp0Tools\dotnet20\;%path%
 
-set _fsiexe="packages\FSharp.Compiler.Tools.4.1.23\tools\fsi.exe"
+set _fsiexe="packages\FSharp.Compiler.Tools.4.1.27\tools\fsi.exe"
 if not exist %_fsiexe% echo Error: Could not find %_fsiexe% && goto :failure
 %_ngenexe% install %_fsiexe% /nologo 
 
@@ -606,8 +606,8 @@ if "%BUILD_PROTO%" == "1" (
 
   if "%BUILD_PROTO_WITH_CORECLR_LKG%" == "0" (
 
-    echo %_ngenexe% install packages\FSharp.Compiler.Tools.4.1.23\tools\fsc.exe /nologo 
-         %_ngenexe% install packages\FSharp.Compiler.Tools.4.1.23\tools\fsc.exe /nologo 
+    echo %_ngenexe% install packages\FSharp.Compiler.Tools.4.1.27\tools\fsc.exe /nologo 
+         %_ngenexe% install packages\FSharp.Compiler.Tools.4.1.27\tools\fsc.exe /nologo 
 
     echo %_msbuildexe% %msbuildflags% src\fsharp-proto-build.proj /p:BUILD_PROTO_WITH_CORECLR_LKG=%BUILD_PROTO_WITH_CORECLR_LKG% /p:Configuration=Proto
          %_msbuildexe% %msbuildflags% src\fsharp-proto-build.proj /p:BUILD_PROTO_WITH_CORECLR_LKG=%BUILD_PROTO_WITH_CORECLR_LKG% /p:Configuration=Proto
diff --git a/configure.ac b/configure.ac
index e8370aa7b77..ec3df2198f6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -46,93 +46,17 @@ MONOPREFIX=$(cd `$PKG_CONFIG --variable=prefix mono` && pwd)
 MONOBINDIR="$MONOPREFIX"/bin
 MONOLIBDIR="$MONOPREFIX"/lib
 
-AC_PATH_PROG(XBUILD, xbuild, no)
-xbuild_from_pkg_config="$MONOBINDIR"/xbuild
-if test -e $xbuild_from_pkg_config; then
-    XBUILD=$xbuild_from_pkg_config
-elif test "x$XBUILD" == "xno"; then
-    AC_MSG_ERROR([Could not find xbuild])
+AC_PATH_PROG(MSBUILD, msbuild, no)
+msbuild_from_pkg_config="$MONOBINDIR"/msbuild
+if test -e $msbuild_from_pkg_config; then
+    MSBUILD=$msbuild_from_pkg_config
+elif test "x$MSBUILD" == "xno"; then
+    AC_MSG_ERROR([Could not find msbuild])
 fi
-AC_MSG_NOTICE(xbuild: $XBUILD)
-
-MONOGACDIR="$MONOLIBDIR"/mono
-if ! test "x$with_gacdir" = "xno"; then
-	MONOGACDIR=$(cd "$with_gacdir/.." && pwd)
-fi
-
-MONOGACDIR40="$MONOGACDIR"/4.0
-MONOGACDIR45="$MONOGACDIR"/4.5
-
-if ! test -e $MONOGACDIR45/mscorlib.dll; then
-	AC_ERROR(Couldn't find the mono gac directory or mscorlib.dll in the usual places. Set --with-gacdir=<path>)
-fi
-
-if test -e $MONOLIBDIR/mono/xbuild-frameworks/.NETPortable/v4.0/Profile/Profile47/mscorlib.dll; then
-   PCLENABLED47=yes
-else
-   PCLENABLED47=no
-fi
-AC_MSG_NOTICE(PCL Reference Assemblies for Profile 47 found: $PCLENABLED47)
-
-AC_SUBST(PCLENABLED47)
-
-
-if test -e $MONOLIBDIR/mono/xbuild-frameworks/.NETPortable/v4.0/Profile/Profile47/mscorlib.dll; then
-   PCLENABLED47=yes
-else
-   PCLENABLED47=no
-fi
-AC_MSG_NOTICE(PCL Reference Assemblies for Profile 47 found: $PCLENABLED47)
-
-AC_SUBST(PCLENABLED47)
-
-
-if test -e $MONOLIBDIR/mono/xbuild-frameworks/.NETPortable/v4.5/Profile/Profile7/System.Runtime.dll; then
-   PCLENABLED7=yes
-else
-   PCLENABLED7=no
-fi
-AC_MSG_NOTICE(PCL Reference Assemblies for Profile 7 found: $PCLENABLED7)
-
-AC_SUBST(PCLENABLED7)
-
-if test -e $MONOLIBDIR/mono/xbuild-frameworks/.NETPortable/v4.5/Profile/Profile78/System.Runtime.dll; then
-   PCLENABLED78=yes
-else
-   PCLENABLED78=no
-fi
-AC_MSG_NOTICE(PCL Reference Assemblies for Profile 78 found: $PCLENABLED78)
-
-AC_SUBST(PCLENABLED78)
-
-if test -e $MONOLIBDIR/mono/xbuild-frameworks/.NETPortable/v4.5/Profile/Profile259/System.Runtime.dll; then
-   PCLENABLED259=yes
-else
-   PCLENABLED259=no
-fi
-AC_MSG_NOTICE(PCL Reference Assemblies for Profile 259 found: $PCLENABLED259)
-
-AC_SUBST(PCLENABLED259)
-
-# We enable MonoTouch and MonoDroid builds if PCL components are available.
-# These build using binaries from dependencies/mono/2.1, but see
-# https://github.com/fsharp/fsharp/issues/391 where PCL is a requirement of
-# Microsoft.Common.targets when used in this configuration
-MONOTOUCHENABLED=$PCLENABLED78
-MONODROIDENABLED=$PCLENABLED78
-XAMARINMACENABLED=$PCLENABLED78
-
-AC_SUBST(MONOTOUCHENABLED)
-AC_SUBST(MONODROIDENABLED)
-AC_SUBST(XAMARINMACENABLED)
+AC_MSG_NOTICE(msbuild: $MSBUILD)
 
 AC_SUBST(MONOBINDIR)
 AC_SUBST(MONOLIBDIR)
-AC_SUBST(MONOGACDIR)
-
-AC_SUBST(MONOGACDIR20)
-AC_SUBST(MONOGACDIR35)
-AC_SUBST(MONOGACDIR40)
 
 AC_CONFIG_FILES([
 mono/launcher
diff --git a/fcs/FSharp.Compiler.Service.MSBuild.v12/FSharp.Compiler.Service.MSBuild.v12.fsproj b/fcs/FSharp.Compiler.Service.MSBuild.v12/FSharp.Compiler.Service.MSBuild.v12.fsproj
index deef4f0e689..e929138c567 100644
--- a/fcs/FSharp.Compiler.Service.MSBuild.v12/FSharp.Compiler.Service.MSBuild.v12.fsproj
+++ b/fcs/FSharp.Compiler.Service.MSBuild.v12/FSharp.Compiler.Service.MSBuild.v12.fsproj
@@ -88,5 +88,5 @@
       <Private>True</Private>
     </ProjectReference>
   </ItemGroup>
-  <Import Project="$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets" />
+  <Import Project="$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets" />
 </Project>
\ No newline at end of file
diff --git a/fcs/FSharp.Compiler.Service.ProjectCracker/FSharp.Compiler.Service.ProjectCracker.fsproj b/fcs/FSharp.Compiler.Service.ProjectCracker/FSharp.Compiler.Service.ProjectCracker.fsproj
index 07625e300ed..b75f912c983 100644
--- a/fcs/FSharp.Compiler.Service.ProjectCracker/FSharp.Compiler.Service.ProjectCracker.fsproj
+++ b/fcs/FSharp.Compiler.Service.ProjectCracker/FSharp.Compiler.Service.ProjectCracker.fsproj
@@ -63,5 +63,5 @@
       <Private>True</Private>
     </ProjectReference>
   </ItemGroup>
-  <Import Project="$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets" />
+  <Import Project="$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets" />
 </Project>
\ No newline at end of file
diff --git a/fcs/FSharp.Compiler.Service.ProjectCrackerTool/FSharp.Compiler.Service.ProjectCrackerTool.fsproj b/fcs/FSharp.Compiler.Service.ProjectCrackerTool/FSharp.Compiler.Service.ProjectCrackerTool.fsproj
index bb29e5b7365..07bae7e5765 100644
--- a/fcs/FSharp.Compiler.Service.ProjectCrackerTool/FSharp.Compiler.Service.ProjectCrackerTool.fsproj
+++ b/fcs/FSharp.Compiler.Service.ProjectCrackerTool/FSharp.Compiler.Service.ProjectCrackerTool.fsproj
@@ -79,5 +79,5 @@
     </Reference>
 
   </ItemGroup>
-  <Import Project="$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets" />
+  <Import Project="$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets" />
 </Project>
\ No newline at end of file
diff --git a/fcs/FSharp.Compiler.Service.Tests/FSharp.Compiler.Service.Tests.fsproj b/fcs/FSharp.Compiler.Service.Tests/FSharp.Compiler.Service.Tests.fsproj
index 1cd80fda4ea..98e86a06448 100644
--- a/fcs/FSharp.Compiler.Service.Tests/FSharp.Compiler.Service.Tests.fsproj
+++ b/fcs/FSharp.Compiler.Service.Tests/FSharp.Compiler.Service.Tests.fsproj
@@ -71,11 +71,11 @@
     <Compile Include="$(FSharpSourcesRoot)\..\tests\service\ProjectOptionsTests.fs">
       <Link>ProjectOptionsTests.fs</Link>
     </Compile>
-    <None Include="$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.23\tools\FSharp.Core.optdata">
+    <None Include="$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.27\tools\FSharp.Core.optdata">
       <Link>FSharp.Core.optdata</Link>
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
-    <None Include="$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.23\tools\FSharp.Core.sigdata">
+    <None Include="$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.27\tools\FSharp.Core.sigdata">
       <Link>FSharp.Core.sigdata</Link>
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
@@ -109,7 +109,7 @@
     </Reference>
     <!-- we test against FSharp.Core 4.4.1.0 -->
     <Reference Include="FSharp.Core">
-      <HintPath>$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.23\tools\FSharp.Core.dll</HintPath>
+      <HintPath>$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.27\tools\FSharp.Core.dll</HintPath>
       <Private>true</Private>
     </Reference>
 
@@ -129,5 +129,5 @@
       <Private>True</Private>
     </ProjectReference>
   </ItemGroup>
-  <Import Project="$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets" />
+  <Import Project="$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets" />
 </Project>
\ No newline at end of file
diff --git a/fcs/FSharp.Compiler.Service/FSharp.Compiler.Service.fsproj b/fcs/FSharp.Compiler.Service/FSharp.Compiler.Service.fsproj
index 639fc875259..07d9840cde2 100644
--- a/fcs/FSharp.Compiler.Service/FSharp.Compiler.Service.fsproj
+++ b/fcs/FSharp.Compiler.Service/FSharp.Compiler.Service.fsproj
@@ -639,7 +639,7 @@
     </Reference>
   </ItemGroup>
 
-  <Import Project="$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets" />
+  <Import Project="$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets" />
   <Import Project="$(FSharpSourcesRoot)\scripts\fssrgen.targets" />
   <Import Project="$(FSharpSourcesRoot)\..\packages\FsLexYacc.7.0.6\build\FsLexYacc.targets" />
 </Project>
\ No newline at end of file
diff --git a/fcs/fcs.props b/fcs/fcs.props
index bed88f78cc1..e7cce1e0c3a 100644
--- a/fcs/fcs.props
+++ b/fcs/fcs.props
@@ -6,7 +6,7 @@
     <VersionPrefix>16.0.2</VersionPrefix>
     <!-- FSharp.Compiler.Tools is currently only used to get a working FSI.EXE to execute some scripts during the build -->
     <!-- The LKG FSI.EXE requires MSBuild 15 to be installed, which is painful -->
-    <FsiToolPath>$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.23\tools</FsiToolPath>
+    <FsiToolPath>$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.27\tools</FsiToolPath>
     <FsiToolExe>fsi.exe</FsiToolExe>
 
   </PropertyGroup>
diff --git a/fcs/samples/EditorService/EditorService.fsproj b/fcs/samples/EditorService/EditorService.fsproj
index 1631ce2e86d..e232d6c5eff 100644
--- a/fcs/samples/EditorService/EditorService.fsproj
+++ b/fcs/samples/EditorService/EditorService.fsproj
@@ -60,5 +60,5 @@
       <Private>True</Private>
     </ProjectReference>
   </ItemGroup>
-  <Import Project="$(SolutionDir)\..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets" />
+  <Import Project="$(SolutionDir)\..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets" />
 </Project>
\ No newline at end of file
diff --git a/fcs/samples/FscExe/FscExe.fsproj b/fcs/samples/FscExe/FscExe.fsproj
index 8849576d1ea..e0ef6ebd4da 100644
--- a/fcs/samples/FscExe/FscExe.fsproj
+++ b/fcs/samples/FscExe/FscExe.fsproj
@@ -59,7 +59,7 @@
   <ItemGroup>
     <!-- we test against FSharp.Core 4.4.1.0 -->
     <Reference Include="FSharp.Core">
-      <HintPath>$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.23\tools\FSharp.Core.dll</HintPath>
+      <HintPath>$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.27\tools\FSharp.Core.dll</HintPath>
       <Private>true</Private>
     </Reference>
     <Reference Include="mscorlib" />
@@ -73,5 +73,5 @@
       <Private>True</Private>
     </ProjectReference>
   </ItemGroup>
-  <Import Project="$(SolutionDir)\..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets" />
+  <Import Project="$(SolutionDir)\..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets" />
 </Project>
\ No newline at end of file
diff --git a/fcs/samples/FsiExe/FsiExe.fsproj b/fcs/samples/FsiExe/FsiExe.fsproj
index 18435f8ff09..ef52e8ee777 100644
--- a/fcs/samples/FsiExe/FsiExe.fsproj
+++ b/fcs/samples/FsiExe/FsiExe.fsproj
@@ -47,7 +47,7 @@
   <ItemGroup>
     <!-- we test against FSharp.Core 4.4.1.0 -->
     <Reference Include="FSharp.Core">
-      <HintPath>$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.23\tools\FSharp.Core.dll</HintPath>
+      <HintPath>$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.27\tools\FSharp.Core.dll</HintPath>
       <Private>true</Private>
     </Reference>
     <Reference Include="mscorlib" />
@@ -71,5 +71,5 @@
       <Private>True</Private>
     </ProjectReference>
   </ItemGroup>
-  <Import Project="$(SolutionDir)\..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets" />
+  <Import Project="$(SolutionDir)\..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets" />
 </Project>
\ No newline at end of file
diff --git a/fcs/samples/InteractiveService/InteractiveService.fsproj b/fcs/samples/InteractiveService/InteractiveService.fsproj
index c6b7ee6240d..4efd2a56b12 100644
--- a/fcs/samples/InteractiveService/InteractiveService.fsproj
+++ b/fcs/samples/InteractiveService/InteractiveService.fsproj
@@ -45,7 +45,7 @@
   <ItemGroup>
     <!-- we test against FSharp.Core 4.4.1.0 -->
     <Reference Include="FSharp.Core">
-      <HintPath>$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.23\tools\FSharp.Core.dll</HintPath>
+      <HintPath>$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.27\tools\FSharp.Core.dll</HintPath>
       <Private>true</Private>
     </Reference>
     <Reference Include="mscorlib" />
@@ -64,5 +64,5 @@
       <Private>True</Private>
     </ProjectReference>
   </ItemGroup>
-  <Import Project="$(SolutionDir)\..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets" />
+  <Import Project="$(SolutionDir)\..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets" />
 </Project>
\ No newline at end of file
diff --git a/fcs/samples/Tokenizer/Tokenizer.fsproj b/fcs/samples/Tokenizer/Tokenizer.fsproj
index 6cbabe463ee..a58aaf190f4 100644
--- a/fcs/samples/Tokenizer/Tokenizer.fsproj
+++ b/fcs/samples/Tokenizer/Tokenizer.fsproj
@@ -45,7 +45,7 @@
   <ItemGroup>
     <!-- we test against FSharp.Core 4.4.1.0 -->
     <Reference Include="FSharp.Core">
-      <HintPath>$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.23\tools\FSharp.Core.dll</HintPath>
+      <HintPath>$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.27\tools\FSharp.Core.dll</HintPath>
       <Private>true</Private>
     </Reference>
     <Reference Include="mscorlib" />
@@ -67,5 +67,5 @@
   <PropertyGroup>
     <MinimumVisualStudioVersion Condition="'$(MinimumVisualStudioVersion)' == ''">11</MinimumVisualStudioVersion>
   </PropertyGroup>
-  <Import Project="$(SolutionDir)\..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets" />
+  <Import Project="$(SolutionDir)\..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets" />
 </Project>
\ No newline at end of file
diff --git a/fcs/samples/UntypedTree/UntypedTree.fsproj b/fcs/samples/UntypedTree/UntypedTree.fsproj
index c99bbab7ebe..e8818931cdd 100644
--- a/fcs/samples/UntypedTree/UntypedTree.fsproj
+++ b/fcs/samples/UntypedTree/UntypedTree.fsproj
@@ -45,7 +45,7 @@
   <ItemGroup>
     <!-- we test against FSharp.Core 4.4.1.0 -->
     <Reference Include="FSharp.Core">
-      <HintPath>$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.23\tools\FSharp.Core.dll</HintPath>
+      <HintPath>$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.27\tools\FSharp.Core.dll</HintPath>
       <Private>true</Private>
     </Reference>
     <Reference Include="mscorlib" />
@@ -67,5 +67,5 @@
   <PropertyGroup>
     <MinimumVisualStudioVersion Condition="'$(MinimumVisualStudioVersion)' == ''">11</MinimumVisualStudioVersion>
   </PropertyGroup>
-  <Import Project="$(SolutionDir)\..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets" />
+  <Import Project="$(SolutionDir)\..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets" />
 </Project>
\ No newline at end of file
diff --git a/mono/FSharp.Compiler.Interactive.Settings/Makefile b/mono/FSharp.Compiler.Interactive.Settings/Makefile
index 6865755fbf2..bb894b51662 100644
--- a/mono/FSharp.Compiler.Interactive.Settings/Makefile
+++ b/mono/FSharp.Compiler.Interactive.Settings/Makefile
@@ -4,7 +4,7 @@ TOKEN=$(SIGN_TOKEN)
 
 include ../config.make
 
-install: install-sdk-lib install-gac-lib
+install: install-sdk-lib
 
 
 
diff --git a/mono/FSharp.Compiler.Server.Shared/Makefile b/mono/FSharp.Compiler.Server.Shared/Makefile
index 6afa337b06b..213bc156d3f 100644
--- a/mono/FSharp.Compiler.Server.Shared/Makefile
+++ b/mono/FSharp.Compiler.Server.Shared/Makefile
@@ -4,7 +4,7 @@ TOKEN=$(SIGN_TOKEN)
 
 include ../config.make
 
-install: install-sdk-lib install-gac-lib
+install: install-sdk-lib
 
 
 
diff --git a/mono/FSharp.Core/Makefile b/mono/FSharp.Core/Makefile
index 261e7fe387a..13667a91613 100644
--- a/mono/FSharp.Core/Makefile
+++ b/mono/FSharp.Core/Makefile
@@ -5,6 +5,6 @@ TOKEN=$(FSCORE_DELAY_SIGN_TOKEN)
 
 include ../config.make
 
-install: install-sdk-lib install-gac-lib
+install: install-sdk-lib
 
 
diff --git a/mono/appveyor.ps1 b/mono/appveyor.ps1
index 021dda8fe0a..b26a52d32f9 100644
--- a/mono/appveyor.ps1
+++ b/mono/appveyor.ps1
@@ -1,6 +1,6 @@
 
 # the version under development, update after a release
-$version = '4.1.27'
+$version = '4.1.28'
 
 function isVersionTag($tag){
     $v = New-Object Version
@@ -27,5 +27,4 @@ function pack($nuspec){
     & $nuget pack $nuspec -BasePath "$dir" -Version $version -OutputDirectory "$packagesOutDir" -NoDefaultExcludes -Verbosity d
 }
 
-pack(gi .\FSharp.Core.Nuget\FSharp.Core.nuspec)
 pack(gi .\FSharp.Compiler.Tools.Nuget\FSharp.Compiler.Tools.nuspec)
diff --git a/mono/build-netcore.bat b/mono/build-netcore.bat
deleted file mode 100755
index 1c28a962199..00000000000
--- a/mono/build-netcore.bat
+++ /dev/null
@@ -1,22 +0,0 @@
-@echo off
-
-:: Check prerequisites
-set _msbuildexe="%ProgramFiles(x86)%\MSBuild\14.0\Bin\MSBuild.exe"
-if not exist %_msbuildexe% set _msbuildexe="%ProgramFiles%\MSBuild\14.0\Bin\MSBuild.exe"
-if not exist %_msbuildexe% set _msbuildexe="%ProgramFiles(x86)%\MSBuild\12.0\Bin\MSBuild.exe"
-if not exist %_msbuildexe% set _msbuildexe="%ProgramFiles%\MSBuild\12.0\Bin\MSBuild.exe"
-if not exist %_msbuildexe% echo Error: Could not find MSBuild.exe.  Please see http://www.microsoft.com/en-us/download/details.aspx?id=40760. && goto :eof
-
-set msbuildflags=/maxcpucount
-
-::Build
-
-%_msbuildexe% %msbuildflags% lib\netcore\build-fsc-netcore.proj /v:n
-@if ERRORLEVEL 1 echo Error: "%_msbuildexe% %msbuildflags% lib\netcore\build-fsc-netcore.proj" failed  && goto :failure
-
-
-@echo "Finished"
-goto :eof
-
-:failure
-exit /b 1
diff --git a/mono/build.bat b/mono/build.bat
deleted file mode 100644
index 330f9fd1086..00000000000
--- a/mono/build.bat
+++ /dev/null
@@ -1,45 +0,0 @@
-@echo off
-
-:: Check prerequisites
-set _msbuildexe="%ProgramFiles(x86)%\MSBuild\14.0\Bin\MSBuild.exe"
-if not exist %_msbuildexe% set _msbuildexe="%ProgramFiles%\MSBuild\14.0\Bin\MSBuild.exe"
-if not exist %_msbuildexe% set _msbuildexe="%ProgramFiles(x86)%\MSBuild\12.0\Bin\MSBuild.exe"
-if not exist %_msbuildexe% set _msbuildexe="%ProgramFiles%\MSBuild\12.0\Bin\MSBuild.exe"
-if not exist %_msbuildexe% echo Error: Could not find MSBuild.exe.  Please see http://www.microsoft.com/en-us/download/details.aspx?id=40760. && goto :eof
-
-set msbuildflags=/maxcpucount
-set _ngenexe="%SystemRoot%\Microsoft.NET\Framework\v4.0.30319\ngen.exe"
-if not exist %_ngenexe% echo Note: Could not find ngen.exe. 
-
-::Build
-
-%_ngenexe% install .\.nuget\NuGet.exe 
-
-.\.nuget\NuGet.exe restore packages.config -PackagesDirectory packages -ConfigFile .nuget\nuget.config
-@if ERRORLEVEL 1 echo Error: Nuget restore failed  && goto :failure
-
-%_ngenexe% install packages\FSharp.Compiler.Tools.4.0.1.21\tools\fsc.exe
-
-set BUILD_NET40=1
-set BUILD_NET40_FSHARP_CORE=1
-set BUILD_PORTABLE=1
-set TEST_NET40_COREUNIT_SUITE=1
-set TEST_PORTABLE_COREUNIT_SUITE=1
-
-%_msbuildexe% src\fsharp-proto-build.proj
-@if ERRORLEVEL 1 echo Error: "%_msbuildexe% src\fsharp-proto-build.proj" failed  && goto :failure
-
-%_ngenexe% install Proto\net440\bin\fsc-proto.exe
-
-%_msbuildexe% %msbuildflags% build-everything.proj /p:TargetDotnetProfile=net40 /p:Configuration=Release
-@if ERRORLEVEL 1 echo Error: "%_msbuildexe% %msbuildflags% src\fsharp-library-build.proj /p:TargetDotnetProfile=net40 /p:Configuration=Release" failed  && goto :failure
-
-%_msbuildexe% %msbuildflags% src/fsharp/FSharp.Core/FSharp.Core.fsproj /p:TargetDotnetProfile=monotouch /p:Configuration=Release /p:KeyFile=..\..\..\mono\mono.snk
-@if ERRORLEVEL 1 echo Error: "%_msbuildexe% %msbuildflags% src\fsharp-library-build.proj /p:TargetDotnetProfile=monotouch /p:Configuration=Release /p:KeyFile=..\..\..\mono.snk" failed  && goto :failure
-
-
-@echo "Finished"
-goto :eof
-
-:failure
-exit /b 1
diff --git a/mono/config.make.in b/mono/config.make.in
index ef700f132b6..3106ab99fd4 100644
--- a/mono/config.make.in
+++ b/mono/config.make.in
@@ -1,6 +1,6 @@
 DEFAULT: all
 
-.PHONY: install-sdk-lib install-gac-lib
+.PHONY: install-sdk-lib
 
 prefix := @prefix@
 topdir := @abs_top_srcdir@/
@@ -9,17 +9,6 @@ libdir := ${prefix}/lib/
 bindir := ${prefix}/bin/
 monobindir := @MONOBINDIR@
 monolibdir := @MONOLIBDIR@
-monogacdir := @MONOGACDIR@
-
-monogacdir40 := @MONOGACDIR40@
-
-pclenabled47 := @PCLENABLED47@
-pclenabled7 := @PCLENABLED7@
-pclenabled78 := @PCLENABLED78@
-pclenabled259 := @PCLENABLED259@
-monotouchenabled := @MONOTOUCHENABLED@
-monodroidenabled := @MONODROIDENABLED@
-xamarinmacenabled := @XAMARINMACENABLED@
 
 monodir := ${libdir}mono
 
@@ -30,6 +19,7 @@ DISTVERSION = 201011
 
 # Version number mappings for various versions of FSharp.Core
 
+
 ifeq (x-$(TargetDotnetProfile)-,x-net40-)
 
 ifeq (x-$(FSharpCoreBackVersion)-,x--)
@@ -105,7 +95,7 @@ INSTALL = $(SHELL) $(topdir)/mono/install-sh
 INSTALL_BIN = $(INSTALL) -c -m 755
 INSTALL_LIB = $(INSTALL_BIN)
 
-XBUILD = @XBUILD@
+MSBUILD = @MSBUILD@
 
 EXTRA_DIST = configure
 NO_DIST = .gitignore lib/debug lib/proto lib/release
@@ -201,6 +191,18 @@ install-sdk-lib:
 	    $(INSTALL_LIB) $(tmpdir)Microsoft.Portable.FSharp.Targets $(DESTDIR)$(monodir)/xbuild/Microsoft/VisualStudio/v12.0/FSharp/; \
 	    $(INSTALL_LIB) $(tmpdir)Microsoft.Portable.FSharp.Targets $(DESTDIR)$(monodir)/xbuild/Microsoft/VisualStudio/v14.0/FSharp/; \
 	    $(INSTALL_LIB) $(tmpdir)Microsoft.Portable.FSharp.Targets $(DESTDIR)$(monodir)/xbuild/Microsoft/VisualStudio/v15.0/FSharp/; \
+	    \
+	    $(INSTALL_LIB) $(outdir)Microsoft.FSharp.NetSdk.props $(DESTDIR)$(monodir)/xbuild/Microsoft/VisualStudio/v/FSharp/; \
+	    $(INSTALL_LIB) $(outdir)Microsoft.FSharp.NetSdk.props $(DESTDIR)$(monodir)/xbuild/Microsoft/VisualStudio/v11.0/FSharp/; \
+	    $(INSTALL_LIB) $(outdir)Microsoft.FSharp.NetSdk.props $(DESTDIR)$(monodir)/xbuild/Microsoft/VisualStudio/v12.0/FSharp/; \
+	    $(INSTALL_LIB) $(outdir)Microsoft.FSharp.NetSdk.props $(DESTDIR)$(monodir)/xbuild/Microsoft/VisualStudio/v14.0/FSharp/; \
+	    $(INSTALL_LIB) $(outdir)Microsoft.FSharp.NetSdk.props $(DESTDIR)$(monodir)/xbuild/Microsoft/VisualStudio/v15.0/FSharp/; \
+	    \
+	    $(INSTALL_LIB) $(outdir)Microsoft.FSharp.NetSdk.targets $(DESTDIR)$(monodir)/xbuild/Microsoft/VisualStudio/v/FSharp/; \
+	    $(INSTALL_LIB) $(outdir)Microsoft.FSharp.NetSdk.targets $(DESTDIR)$(monodir)/xbuild/Microsoft/VisualStudio/v11.0/FSharp/; \
+	    $(INSTALL_LIB) $(outdir)Microsoft.FSharp.NetSdk.targets $(DESTDIR)$(monodir)/xbuild/Microsoft/VisualStudio/v12.0/FSharp/; \
+	    $(INSTALL_LIB) $(outdir)Microsoft.FSharp.NetSdk.targets $(DESTDIR)$(monodir)/xbuild/Microsoft/VisualStudio/v14.0/FSharp/; \
+	    $(INSTALL_LIB) $(outdir)Microsoft.FSharp.NetSdk.targets $(DESTDIR)$(monodir)/xbuild/Microsoft/VisualStudio/v15.0/FSharp/; \
 	fi
 	@if test x-$(outsuffix) = x-net40; then \
 	    if test -e $(outdir)$(NAME).dll; then \
@@ -248,52 +250,6 @@ install-sdk-lib:
 			$(INSTALL_LIB) $(outdir)$(NAME).dll $(DESTDIR)$(monodir)/fsharp/api/$(PCLPATH)/$(VERSION)/; \
 	fi
 
-# Install the library binaries in the GAC directory, 
-install-gac-lib:
-	$(eval TARGET = "4.5")
-	@echo "Installing $(ASSEMBLY)"
-	@if test "x$(DELAY_SIGN)" = "x1"; then \
-	    echo "Signing $(outdir)$(ASSEMBLY) with Mono key"; \
-	    $(monobindir)/sn -q -R $(outdir)$(ASSEMBLY) $(topdir)mono/mono.snk; \
-	fi
-	@if test -e $(outdir)$(NAME).dll; then \
-			if test x-$(NAME) = x-FSharp.Core && test x-$(PKGINSTALL) = x-yes; then \
-				echo "Using gacutil to install $(outdir)$(ASSEMBLY) into GAC root $(DESTDIR)$(libdir) as package $(TARGET)"; \
-				$(monobindir)/gacutil -i $(outdir)$(ASSEMBLY) -root $(DESTDIR)$(libdir) -package $(TARGET); \
-			else \
-				echo "Installing $(outdir)$(NAME).dll to $(DESTDIR)$(monodir)/gac/$(NAME)/$(VERSION)__$(TOKEN)/"; \
-				mkdir -p $(DESTDIR)$(monodir)/gac/$(NAME)/$(VERSION)__$(TOKEN)/; \
-				$(INSTALL_LIB) $(outdir)$(NAME).dll $(DESTDIR)$(monodir)/gac/$(NAME)/$(VERSION)__$(TOKEN)/; \
-			fi; \
-	fi
-
-	@if test -e $(outdir)$(NAME).xml; then \
-			echo "Installing $(outdir)$(NAME).xml into $(DESTDIR)$(monodir)/gac/$(NAME)/$(VERSION)__$(TOKEN)/"; \
-			mkdir -p $(DESTDIR)$(monodir)/gac/$(NAME)/$(VERSION)__$(TOKEN)/; \
-			$(INSTALL_LIB) $(outdir)$(NAME).xml $(DESTDIR)$(monodir)/gac/$(NAME)/$(VERSION)__$(TOKEN)/; \
-			if test x-$(PKGINSTALL) = x-yes && test x-$(NAME) = x-FSharp.Core; then \
-				echo "Using linking to ../gac/$(NAME)/$(VERSION)__$(TOKEN)/$(NAME).xml to install $(DESTDIR)$(libdir)mono/$(TARGET)/$(NAME).xml"; \
-				ln -fs  ../gac/$(NAME)/$(VERSION)__$(TOKEN)/$(NAME).xml $(DESTDIR)$(libdir)mono/$(TARGET)/$(NAME).xml; \
-			fi; \
-	fi
-	@if test -e $(outdir)$(NAME).sigdata; then \
-			echo "Installing $(outdir)$(NAME).sigdata into $(DESTDIR)$(monodir)/gac/$(NAME)/$(VERSION)__$(TOKEN)/"; \
-			mkdir -p $(DESTDIR)$(monodir)/gac/$(NAME)/$(VERSION)__$(TOKEN)/; \
-			$(INSTALL_LIB) $(outdir)$(NAME).sigdata $(DESTDIR)$(monodir)/gac/$(NAME)/$(VERSION)__$(TOKEN)/; \
-			if test x-$(PKGINSTALL) = x-yes; then \
-				echo "Using linking to ../gac/$(NAME)/$(VERSION)__$(TOKEN)/$(NAME).sigdata to install $(DESTDIR)$(libdir)mono/$(TARGET)/$(NAME).sigdata"; \
-				ln -fs  ../gac/$(NAME)/$(VERSION)__$(TOKEN)/$(NAME).sigdata $(DESTDIR)$(libdir)mono/$(TARGET)/$(NAME).sigdata; \
-			fi; \
-	fi
-	@if test -e $(outdir)$(NAME).optdata; then \
-			echo "Installing $(outdir)$(NAME).optdata into $(DESTDIR)$(monodir)/gac/$(NAME)/$(VERSION)__$(TOKEN)/"; \
-			mkdir -p $(DESTDIR)$(monodir)/gac/$(NAME)/$(VERSION)__$(TOKEN)/; \
-			$(INSTALL_LIB) $(outdir)$(NAME).optdata $(DESTDIR)$(monodir)/gac/$(NAME)/$(VERSION)__$(TOKEN)/; \
-			if test x-$(PKGINSTALL) = x-yes; then \
-				echo "Using linking to ../gac/$(NAME)/$(VERSION)__$(TOKEN)/$(NAME).optdata to install $(DESTDIR)$(libdir)mono/$(TARGET)/$(NAME).optdata"; \
-				ln -fs  ../gac/$(NAME)/$(VERSION)__$(TOKEN)/$(NAME).optdata $(DESTDIR)$(libdir)mono/$(TARGET)/$(NAME).optdata; \
-			fi; \
-	fi
 
 
 # The binaries fsc.exe and fsi.exe only get installed for Mono 4.5 profile
diff --git a/mono/policy.2.0.FSharp.Core/Makefile b/mono/policy.2.0.FSharp.Core/Makefile
deleted file mode 100644
index b224aca1d1f..00000000000
--- a/mono/policy.2.0.FSharp.Core/Makefile
+++ /dev/null
@@ -1,22 +0,0 @@
-NAME=policy.2.0.FSharp.Core
-ASSEMBLY = $(NAME).dll
-DELAY_SIGN=1
-TOKEN=$(FSCORE_DELAY_SIGN_TOKEN)
-
-include ../config.make
-
-$(outdir)$(NAME).dll: $(NAME).dll.config 
-	@mkdir -p $(@D)
-	cp $(NAME).dll.config $(@D)
-	$(monobindir)/al /link:$(NAME).dll.config /out:$@ /delaysign /keyfile:$(topdir)mono/msfinal.pub
-
-build: 
-	$(MAKE) $(outdir)$(NAME).dll
-
-clean: 
-	-rm -f $(outdir)$(NAME).dll 
-
-install: install-sdk-lib install-gac-lib
-
-
-
diff --git a/mono/policy.2.0.FSharp.Core/policy.2.0.FSharp.Core.dll.config b/mono/policy.2.0.FSharp.Core/policy.2.0.FSharp.Core.dll.config
deleted file mode 100644
index b533a63135d..00000000000
--- a/mono/policy.2.0.FSharp.Core/policy.2.0.FSharp.Core.dll.config
+++ /dev/null
@@ -1,17 +0,0 @@
-<?xml version="1.0" encoding="utf-8" ?>
-<configuration>
-   <runtime>
-      <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1" appliesTo="v2.0.50727">
-         <dependentAssembly>
-            <assemblyIdentity name="FSharp.Core" publicKeyToken="b03f5f7f11d50a3a" processorArchitecture="msil" Culture="neutral" />
-            <bindingRedirect oldVersion="2.0.0.0" newVersion="2.3.1.0" />
-         </dependentAssembly>
-      </assemblyBinding>
-      <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1" appliesTo="v4.0.30319">
-         <dependentAssembly>
-            <assemblyIdentity name="FSharp.Core" publicKeyToken="b03f5f7f11d50a3a" processorArchitecture="msil" Culture="neutral" />
-            <bindingRedirect oldVersion="2.0.0.0" newVersion="4.4.1.0" />
-         </dependentAssembly>
-      </assemblyBinding>
-   </runtime>
-</configuration> 
diff --git a/mono/policy.2.3.FSharp.Core/Makefile b/mono/policy.2.3.FSharp.Core/Makefile
deleted file mode 100644
index 6158f76d21c..00000000000
--- a/mono/policy.2.3.FSharp.Core/Makefile
+++ /dev/null
@@ -1,22 +0,0 @@
-NAME=policy.2.3.FSharp.Core
-ASSEMBLY = $(NAME).dll
-DELAY_SIGN=1
-TOKEN=$(FSCORE_DELAY_SIGN_TOKEN)
-
-include ../config.make
-
-# override the targets to build the assembly
-
-$(outdir)$(NAME).dll: $(NAME).dll.config 
-	@mkdir -p $(@D)
-	cp $(NAME).dll.config $(@D)
-	$(monobindir)/al /link:$(NAME).dll.config /out:$@ /delaysign /keyfile:$(topdir)mono/msfinal.pub
-
-build: 
-	$(MAKE) $(outdir)$(NAME).dll
-
-clean: 
-	-rm -f $(outdir)$(NAME).dll 
-
-install: install-sdk-lib install-gac-lib
-
diff --git a/mono/policy.2.3.FSharp.Core/policy.2.3.FSharp.Core.dll.config b/mono/policy.2.3.FSharp.Core/policy.2.3.FSharp.Core.dll.config
deleted file mode 100644
index f211873a0ab..00000000000
--- a/mono/policy.2.3.FSharp.Core/policy.2.3.FSharp.Core.dll.config
+++ /dev/null
@@ -1,18 +0,0 @@
-<?xml version="1.0" encoding="utf-8" ?>
-<configuration>
-   <runtime>
-      <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1" appliesTo="v2.0.50727">
-         <dependentAssembly>
-            <assemblyIdentity name="FSharp.Core" publicKeyToken="b03f5f7f11d50a3a" processorArchitecture="msil" Culture="neutral" />
-            <bindingRedirect oldVersion="2.3.5.0" newVersion="2.3.1.0" />
-            <bindingRedirect oldVersion="2.3.5.1" newVersion="2.3.1.0" />
-         </dependentAssembly>
-      </assemblyBinding>
-      <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1" appliesTo="v4.0.30319">
-         <dependentAssembly>
-            <assemblyIdentity name="FSharp.Core" publicKeyToken="b03f5f7f11d50a3a" processorArchitecture="msil" Culture="neutral" />
-            <bindingRedirect oldVersion="2.3.0.0-2.3.5.1" newVersion="4.4.1.0" />
-         </dependentAssembly>
-      </assemblyBinding>
-   </runtime>
-</configuration> 
diff --git a/mono/policy.3.259.FSharp.Core/Makefile b/mono/policy.3.259.FSharp.Core/Makefile
deleted file mode 100644
index e51e01099a0..00000000000
--- a/mono/policy.3.259.FSharp.Core/Makefile
+++ /dev/null
@@ -1,19 +0,0 @@
-NAME=policy.3.259.FSharp.Core
-ASSEMBLY = $(NAME).dll
-DELAY_SIGN=1
-TOKEN=$(FSCORE_DELAY_SIGN_TOKEN)
-
-include ../config.make
-
-$(outdir)$(NAME).dll: $(NAME).dll.config 
-	@mkdir -p $(@D)
-	cp $(NAME).dll.config $(@D)
-	$(monobindir)/al /link:$(NAME).dll.config /out:$@ /delaysign /keyfile:$(topdir)mono/msfinal.pub
-
-build: 
-	$(MAKE) $(outdir)$(NAME).dll
-
-clean: 
-	-rm -f $(outdir)$(NAME).dll 
-
-install: install-sdk-lib install-gac-lib
\ No newline at end of file
diff --git a/mono/policy.3.259.FSharp.Core/policy.3.259.FSharp.Core.dll.config b/mono/policy.3.259.FSharp.Core/policy.3.259.FSharp.Core.dll.config
deleted file mode 100644
index c6cf7415894..00000000000
--- a/mono/policy.3.259.FSharp.Core/policy.3.259.FSharp.Core.dll.config
+++ /dev/null
@@ -1,11 +0,0 @@
-<?xml version="1.0" encoding="utf-8" ?>
-<configuration>
-   <runtime>
-      <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
-         <dependentAssembly>
-            <assemblyIdentity name="FSharp.Core" publicKeyToken="b03f5f7f11d50a3a" processorArchitecture="msil" Culture="neutral" />
-            <bindingRedirect oldVersion="3.259.3.1-3.259.41.0" newVersion="4.4.1.0" />
-         </dependentAssembly>
-      </assemblyBinding>
-   </runtime>
-</configuration> 
diff --git a/mono/policy.3.3.FSharp.Core/Makefile b/mono/policy.3.3.FSharp.Core/Makefile
deleted file mode 100644
index 7384f56497b..00000000000
--- a/mono/policy.3.3.FSharp.Core/Makefile
+++ /dev/null
@@ -1,19 +0,0 @@
-NAME=policy.3.3.FSharp.Core
-ASSEMBLY = $(NAME).dll
-DELAY_SIGN=1
-TOKEN=$(FSCORE_DELAY_SIGN_TOKEN)
-
-include ../config.make
-
-$(outdir)$(NAME).dll: $(NAME).dll.config 
-	@mkdir -p $(@D)
-	cp $(NAME).dll.config $(@D)
-	$(monobindir)/al /link:$(NAME).dll.config /out:$@ /delaysign /keyfile:$(topdir)mono/msfinal.pub
-
-build: 
-	$(MAKE) $(outdir)$(NAME).dll
-
-clean: 
-	-rm -f $(outdir)$(NAME).dll 
-
-install: install-sdk-lib install-gac-lib
\ No newline at end of file
diff --git a/mono/policy.3.3.FSharp.Core/policy.3.3.FSharp.Core.dll.config b/mono/policy.3.3.FSharp.Core/policy.3.3.FSharp.Core.dll.config
deleted file mode 100644
index eecc0dddec4..00000000000
--- a/mono/policy.3.3.FSharp.Core/policy.3.3.FSharp.Core.dll.config
+++ /dev/null
@@ -1,11 +0,0 @@
-<?xml version="1.0" encoding="utf-8" ?>
-<configuration>
-   <runtime>
-      <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
-         <dependentAssembly>
-            <assemblyIdentity name="FSharp.Core" publicKeyToken="b03f5f7f11d50a3a" processorArchitecture="msil" Culture="neutral" />
-            <bindingRedirect oldVersion="3.3.1.0" newVersion="4.4.1.0" />
-         </dependentAssembly>
-      </assemblyBinding>
-   </runtime>
-</configuration> 
diff --git a/mono/policy.3.47.FSharp.Core/Makefile b/mono/policy.3.47.FSharp.Core/Makefile
deleted file mode 100644
index 34027eaafd7..00000000000
--- a/mono/policy.3.47.FSharp.Core/Makefile
+++ /dev/null
@@ -1,19 +0,0 @@
-NAME=policy.3.47.FSharp.Core
-ASSEMBLY = $(NAME).dll
-DELAY_SIGN=1
-TOKEN=$(FSCORE_DELAY_SIGN_TOKEN)
-
-include ../config.make
-
-$(outdir)$(NAME).dll: $(NAME).dll.config 
-	@mkdir -p $(@D)
-	cp $(NAME).dll.config $(@D)
-	$(monobindir)/al /link:$(NAME).dll.config /out:$@ /delaysign /keyfile:$(topdir)mono/msfinal.pub
-
-build: 
-	$(MAKE) $(outdir)$(NAME).dll
-
-clean: 
-	-rm -f $(outdir)$(NAME).dll 
-
-install: install-sdk-lib install-gac-lib
\ No newline at end of file
diff --git a/mono/policy.3.47.FSharp.Core/policy.3.47.FSharp.Core.dll.config b/mono/policy.3.47.FSharp.Core/policy.3.47.FSharp.Core.dll.config
deleted file mode 100644
index f5eaaa99057..00000000000
--- a/mono/policy.3.47.FSharp.Core/policy.3.47.FSharp.Core.dll.config
+++ /dev/null
@@ -1,11 +0,0 @@
-<?xml version="1.0" encoding="utf-8" ?>
-<configuration>
-   <runtime>
-      <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
-         <dependentAssembly>
-            <assemblyIdentity name="FSharp.Core" publicKeyToken="b03f5f7f11d50a3a" processorArchitecture="msil" Culture="neutral" />
-            <bindingRedirect oldVersion="3.47.4.0-3.47.41.0" newVersion="4.4.1.0" />
-         </dependentAssembly>
-      </assemblyBinding>
-   </runtime>
-</configuration> 
diff --git a/mono/policy.3.7.FSharp.Core/Makefile b/mono/policy.3.7.FSharp.Core/Makefile
deleted file mode 100644
index 1a0420e9526..00000000000
--- a/mono/policy.3.7.FSharp.Core/Makefile
+++ /dev/null
@@ -1,19 +0,0 @@
-NAME=policy.3.7.FSharp.Core
-ASSEMBLY = $(NAME).dll
-DELAY_SIGN=1
-TOKEN=$(FSCORE_DELAY_SIGN_TOKEN)
-
-include ../config.make
-
-$(outdir)$(NAME).dll: $(NAME).dll.config 
-	@mkdir -p $(@D)
-	cp $(NAME).dll.config $(@D)
-	$(monobindir)/al /link:$(NAME).dll.config /out:$@ /delaysign /keyfile:$(topdir)mono/msfinal.pub
-
-build: 
-	$(MAKE) $(outdir)$(NAME).dll
-
-clean: 
-	-rm -f $(outdir)$(NAME).dll 
-
-install: install-sdk-lib install-gac-lib
\ No newline at end of file
diff --git a/mono/policy.3.7.FSharp.Core/policy.3.7.FSharp.Core.dll.config b/mono/policy.3.7.FSharp.Core/policy.3.7.FSharp.Core.dll.config
deleted file mode 100644
index 791007a1d95..00000000000
--- a/mono/policy.3.7.FSharp.Core/policy.3.7.FSharp.Core.dll.config
+++ /dev/null
@@ -1,11 +0,0 @@
-<?xml version="1.0" encoding="utf-8" ?>
-<configuration>
-   <runtime>
-      <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
-         <dependentAssembly>
-            <assemblyIdentity name="FSharp.Core" publicKeyToken="b03f5f7f11d50a3a" processorArchitecture="msil" Culture="neutral" />
-            <bindingRedirect oldVersion="3.7.4.0-3.7.41.0" newVersion="4.4.1.0" />
-         </dependentAssembly>
-      </assemblyBinding>
-   </runtime>
-</configuration> 
diff --git a/mono/policy.3.78.FSharp.Core/Makefile b/mono/policy.3.78.FSharp.Core/Makefile
deleted file mode 100644
index 59d9df135f0..00000000000
--- a/mono/policy.3.78.FSharp.Core/Makefile
+++ /dev/null
@@ -1,19 +0,0 @@
-NAME=policy.3.78.FSharp.Core
-ASSEMBLY = $(NAME).dll
-DELAY_SIGN=1
-TOKEN=$(FSCORE_DELAY_SIGN_TOKEN)
-
-include ../config.make
-
-$(outdir)$(NAME).dll: $(NAME).dll.config 
-	@mkdir -p $(@D)
-	cp $(NAME).dll.config $(@D)
-	$(monobindir)/al /link:$(NAME).dll.config /out:$@ /delaysign /keyfile:$(topdir)mono/msfinal.pub
-
-build: 
-	$(MAKE) $(outdir)$(NAME).dll
-
-clean: 
-	-rm -f $(outdir)$(NAME).dll 
-
-install: install-sdk-lib install-gac-lib
\ No newline at end of file
diff --git a/mono/policy.3.78.FSharp.Core/policy.3.78.FSharp.Core.dll.config b/mono/policy.3.78.FSharp.Core/policy.3.78.FSharp.Core.dll.config
deleted file mode 100644
index bd7261c4725..00000000000
--- a/mono/policy.3.78.FSharp.Core/policy.3.78.FSharp.Core.dll.config
+++ /dev/null
@@ -1,11 +0,0 @@
-<?xml version="1.0" encoding="utf-8" ?>
-<configuration>
-   <runtime>
-      <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
-         <dependentAssembly>
-            <assemblyIdentity name="FSharp.Core" publicKeyToken="b03f5f7f11d50a3a" processorArchitecture="msil" Culture="neutral" />
-            <bindingRedirect oldVersion="3.78.3.1-3.78.41.0" newVersion="4.4.1.0" />
-         </dependentAssembly>
-      </assemblyBinding>
-   </runtime>
-</configuration> 
diff --git a/mono/policy.4.0.FSharp.Core/Makefile b/mono/policy.4.0.FSharp.Core/Makefile
deleted file mode 100644
index 6b71e4fc0be..00000000000
--- a/mono/policy.4.0.FSharp.Core/Makefile
+++ /dev/null
@@ -1,19 +0,0 @@
-NAME=policy.4.0.FSharp.Core
-ASSEMBLY = $(NAME).dll
-DELAY_SIGN=1
-TOKEN=$(FSCORE_DELAY_SIGN_TOKEN)
-
-include ../config.make
-
-$(outdir)$(NAME).dll: $(NAME).dll.config 
-	@mkdir -p $(@D)
-	cp $(NAME).dll.config $(@D)
-	$(monobindir)/al /link:$(NAME).dll.config /out:$@ /delaysign /keyfile:$(topdir)mono/msfinal.pub
-
-build: 
-	$(MAKE) $(outdir)$(NAME).dll
-
-clean: 
-	-rm -f $(outdir)$(NAME).dll 
-
-install: install-sdk-lib install-gac-lib
\ No newline at end of file
diff --git a/mono/policy.4.0.FSharp.Core/policy.4.0.FSharp.Core.dll.config b/mono/policy.4.0.FSharp.Core/policy.4.0.FSharp.Core.dll.config
deleted file mode 100644
index 88b8cf82c9a..00000000000
--- a/mono/policy.4.0.FSharp.Core/policy.4.0.FSharp.Core.dll.config
+++ /dev/null
@@ -1,11 +0,0 @@
-<?xml version="1.0" encoding="utf-8" ?>
-<configuration>
-   <runtime>
-      <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
-         <dependentAssembly>
-            <assemblyIdentity name="FSharp.Core" publicKeyToken="b03f5f7f11d50a3a" processorArchitecture="msil" Culture="neutral" />
-            <bindingRedirect oldVersion="4.0.0.0" newVersion="4.4.1.0" />
-         </dependentAssembly>
-      </assemblyBinding>
-   </runtime>
-</configuration> 
diff --git a/mono/policy.4.3.FSharp.Core/Makefile b/mono/policy.4.3.FSharp.Core/Makefile
deleted file mode 100644
index 80ca0747c72..00000000000
--- a/mono/policy.4.3.FSharp.Core/Makefile
+++ /dev/null
@@ -1,19 +0,0 @@
-NAME=policy.4.3.FSharp.Core
-ASSEMBLY = $(NAME).dll
-DELAY_SIGN=1
-TOKEN=$(FSCORE_DELAY_SIGN_TOKEN)
-
-include ../config.make
-
-$(outdir)$(NAME).dll: $(NAME).dll.config 
-	@mkdir -p $(@D)
-	cp $(NAME).dll.config $(@D)
-	$(monobindir)/al /link:$(NAME).dll.config /out:$@ /delaysign /keyfile:$(topdir)mono/msfinal.pub
-
-build: 
-	$(MAKE) $(outdir)$(NAME).dll
-
-clean: 
-	-rm -f $(outdir)$(NAME).dll 
-
-install: install-sdk-lib install-gac-lib
\ No newline at end of file
diff --git a/mono/policy.4.3.FSharp.Core/policy.4.3.FSharp.Core.dll.config b/mono/policy.4.3.FSharp.Core/policy.4.3.FSharp.Core.dll.config
deleted file mode 100644
index d84baa71b56..00000000000
--- a/mono/policy.4.3.FSharp.Core/policy.4.3.FSharp.Core.dll.config
+++ /dev/null
@@ -1,11 +0,0 @@
-<?xml version="1.0" encoding="utf-8" ?>
-<configuration>
-   <runtime>
-      <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
-         <dependentAssembly>
-            <assemblyIdentity name="FSharp.Core" publicKeyToken="b03f5f7f11d50a3a" processorArchitecture="msil" Culture="neutral" />
-            <bindingRedirect oldVersion="4.3.0.0-4.3.1.0" newVersion="4.4.1.0" />
-         </dependentAssembly>
-      </assemblyBinding>
-   </runtime>
-</configuration> 
diff --git a/mono/policy.4.4.FSharp.Core/Makefile b/mono/policy.4.4.FSharp.Core/Makefile
deleted file mode 100644
index b55467817f8..00000000000
--- a/mono/policy.4.4.FSharp.Core/Makefile
+++ /dev/null
@@ -1,19 +0,0 @@
-NAME=policy.4.4.FSharp.Core
-ASSEMBLY = $(NAME).dll
-DELAY_SIGN=1
-TOKEN=$(FSCORE_DELAY_SIGN_TOKEN)
-
-include ../config.make
-
-$(outdir)$(NAME).dll: $(NAME).dll.config 
-	@mkdir -p $(@D)
-	cp $(NAME).dll.config $(@D)
-	$(monobindir)/al /link:$(NAME).dll.config /out:$@ /delaysign /keyfile:$(topdir)mono/msfinal.pub
-
-build: 
-	$(MAKE) $(outdir)$(NAME).dll
-
-clean: 
-	-rm -f $(outdir)$(NAME).dll 
-
-install: install-sdk-lib install-gac-lib
\ No newline at end of file
diff --git a/mono/policy.4.4.FSharp.Core/policy.4.4.FSharp.Core.dll.config b/mono/policy.4.4.FSharp.Core/policy.4.4.FSharp.Core.dll.config
deleted file mode 100644
index a76ad3acd42..00000000000
--- a/mono/policy.4.4.FSharp.Core/policy.4.4.FSharp.Core.dll.config
+++ /dev/null
@@ -1,11 +0,0 @@
-<?xml version="1.0" encoding="utf-8" ?>
-<configuration>
-   <runtime>
-      <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
-         <dependentAssembly>
-            <assemblyIdentity name="FSharp.Core" publicKeyToken="b03f5f7f11d50a3a" processorArchitecture="msil" Culture="neutral" />
-            <bindingRedirect oldVersion="4.3.0.0-4.4.0.0" newVersion="4.4.1.0" />
-         </dependentAssembly>
-      </assemblyBinding>
-   </runtime>
-</configuration> 
diff --git a/mono/prepare-mono.sh b/mono/prepare-mono.sh
index 93545103196..77f3e18b99d 100755
--- a/mono/prepare-mono.sh
+++ b/mono/prepare-mono.sh
@@ -21,9 +21,9 @@ esac
 # On Linux (or at least, Ubuntu), when building with Mono, need to install the mono-devel package first.
 if [ $OS = 'Linux' ]; then
     sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
-    echo "deb http://download.mono-project.com/repo/debian wheezy main" | sudo tee /etc/apt/sources.list.d/mono-xamarin.list
+    echo "deb http://download.mono-project.com/repo/ubuntu trusty main" | sudo tee /etc/apt/sources.list.d/mono-xamarin.list
     sudo apt-get update
-    sudo apt-get -y install mono-devel
+    sudo apt-get -y install mono-devel msbuild
 fi
 
 # Check if SSL certificates have been imported into Mono's certificate store.
@@ -54,10 +54,10 @@ fi)
 fi)
 
 #TODO: work out how to avoid the need for this
-echo "chmod u+x packages/FSharp.Compiler.Tools.4.1.23/tools/fsi.exe"
-echo "chmod u+x packages/FsLexYacc.7.0.4/build/fslex.exe"
-echo "chmod u+x packages/FsLexYacc.7.0.4/build/fsyacc.exe"
-chmod u+x packages/FSharp.Compiler.Tools.4.1.23/tools/fsi.exe 
+echo "chmod u+x packages/FSharp.Compiler.Tools.4.1.27/tools/fsi.exe"
+echo "chmod u+x packages/FsLexYacc.7.0.6/build/fslex.exe"
+echo "chmod u+x packages/FsLexYacc.7.0.6/build/fsyacc.exe"
+chmod u+x packages/FSharp.Compiler.Tools.4.1.27/tools/fsi.exe 
 chmod u+x packages/FsLexYacc.7.0.6/build/fslex.exe
 chmod u+x packages/FsLexYacc.7.0.6/build/fsyacc.exe
 
diff --git a/mono/travis-autogen.sh b/mono/travis-autogen.sh
index e4725f81cb0..9c356b0862f 100755
--- a/mono/travis-autogen.sh
+++ b/mono/travis-autogen.sh
@@ -3,7 +3,8 @@
 echo "TRAVIS_OS_NAME=$TRAVIS_OS_NAME" 
 if [ "$TRAVIS_OS_NAME" = "osx" ];
     then
-        monoVer=$(mono --version | head -n 1 | cut -d' ' -f 5)
+        # Parse 'Mono JIT compiler version 5.0.1.1' to '5.0.1'
+        monoVer=$(mono --version | head -n 1 | cut -d' ' -f 5 | cut -d'.' -f 1-3)
         prefix="/Library/Frameworks/Mono.framework/Versions/$monoVer";
     else 
     	prefix="/usr";
diff --git a/packages.config b/packages.config
index 8a0d01eaaed..ff5ad0ff98d 100644
--- a/packages.config
+++ b/packages.config
@@ -39,11 +39,23 @@
 
   <!-- FSharp.Compiler.Tools is only used to get a working FSI.EXE to execute some scripts during the build -->
   <!-- The LKG FSI.EXE requires MSBuild 15 to be installed, which is painful -->
-  <package id="FSharp.Compiler.Tools" version="4.1.23"/>
+  <package id="FSharp.Compiler.Tools" version="4.1.27"/>
 
   <!-- Frozen portable library versions of FSharp.Core.dll (simply a renamed fsharp.core.4.1.18-->
   <package id="Microsoft.Portable.FSharp.Core" version="4.1.20"/>
 
+  <!-- FSharp.Core is used to get back versions of FSharp.Core -->
+  <package id="FSharp.Core" version="4.1.17"/>
+
+  <!-- FSharp.Core is used to get back versions of FSharp.Core -->
+  <package id="FSharp.Core" version="4.0.0.1"/>
+
+  <!-- FSharp.Core is used to get back versions of FSharp.Core -->
+  <package id="FSharp.Core" version="3.1.2.5"/>
+
+  <!-- FSharp.Core is used to get back versions of FSharp.Core -->
+  <package id="FSharp.Core" version="3.0.2"/>
+
   <!-- FSharp.Data is used in some of the scripts ued for the coreclr build -->
   <package id="FSharp.Data" version="2.2.5" />
 
diff --git a/src/FSharpSource.Settings.targets b/src/FSharpSource.Settings.targets
index 11a1cd12bda..7f964f14beb 100644
--- a/src/FSharpSource.Settings.targets
+++ b/src/FSharpSource.Settings.targets
@@ -141,7 +141,7 @@
 
     <!-- FSharp.Compiler.Tools is currently only used to get a working FSI.EXE to execute some scripts during the build -->
     <!-- The LKG FSI.EXE requires MSBuild 15 to be installed, which is painful -->
-    <FsiToolPath>$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.23\tools</FsiToolPath>
+    <FsiToolPath>$(FSharpSourcesRoot)\..\packages\FSharp.Compiler.Tools.4.1.27\tools</FsiToolPath>
   </PropertyGroup>
 
   <Import Project="../Tools/Build.Common.props" Condition="'$(TargetDotnetProfile)'=='coreclr'"/>
diff --git a/src/FSharpSource.targets b/src/FSharpSource.targets
index 188448b2a44..5d09fd3373d 100644
--- a/src/FSharpSource.targets
+++ b/src/FSharpSource.targets
@@ -157,7 +157,7 @@
         <OutputPath>$(FSharpSourcesRoot)\..\$(Configuration)\$(ProtoFlavour)\bin</OutputPath>
         <!-- When using coreclr to bootstrap to proto. We acquire the FSharp.Core LKG, targets LKG, the FSharp.Build LKG from the .NET Framework compiler tools LKG package. -->
         <FSharpNetCoreLkgPath>$(FSharpSourcesRoot)\..\Tools\dotnet20\sdk\2.0.0-preview2-006502\FSharp</FSharpNetCoreLkgPath>
-        <FSharpTargetsPath>..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets</FSharpTargetsPath>
+        <FSharpTargetsPath>..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets</FSharpTargetsPath>
 
         <!-- When using coreclr to bootstrap, the compiler binary comes from the coreclr LKG, invoked using corehost.exe -->
         <FscToolPath>$(FSharpSourcesRoot)\..\Tools\dotnet20</FscToolPath>
@@ -170,7 +170,7 @@
        <!-- Use .NET Framework to bootstrap to proto -->
       <PropertyGroup >
         <OutputPath>$(FSharpSourcesRoot)\..\$(Configuration)\$(ProtoFlavour)\bin</OutputPath>
-        <FSharpTargetsPath>..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets</FSharpTargetsPath>
+        <FSharpTargetsPath>..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets</FSharpTargetsPath>
       </PropertyGroup>
     </When>
     <When Condition="'$(BuildWith)' == '' AND '$(TargetDotnetProfile)'=='coreclr'">
diff --git a/tests/fsharp/core/attributes/test.fsx b/tests/fsharp/core/attributes/test.fsx
index 991311b9720..e31a35b9106 100644
--- a/tests/fsharp/core/attributes/test.fsx
+++ b/tests/fsharp/core/attributes/test.fsx
@@ -1333,6 +1333,7 @@ module BugWithOverloadedAttributes =
     [<FooAttribute(value = 42)>]
     type Bar = class end
 
+#if !TESTS_AS_APP && !FX_PORTABLE_OR_NETSTANDARD
 module Bug719b = 
 
     open TestLibModule.Bug719
@@ -1340,6 +1341,7 @@ module Bug719b =
     type Bar =
         interface IFoo with
             member __.Test (?value:int) = value.ToString()
+#endif
 
 (*-------------------------------------------------------------------------
 !* Test passed?
diff --git a/tests/projects/Sample_VS2012_FSharp_ConsoleApp_net45_with_resource_using_bootstrap/Sample_VS2012_FSharp_ConsoleApp_net45/Sample_VS2012_FSharp_ConsoleApp_net45.fsproj b/tests/projects/Sample_VS2012_FSharp_ConsoleApp_net45_with_resource_using_bootstrap/Sample_VS2012_FSharp_ConsoleApp_net45/Sample_VS2012_FSharp_ConsoleApp_net45.fsproj
index c2104e72a0b..fbbac89edf7 100644
--- a/tests/projects/Sample_VS2012_FSharp_ConsoleApp_net45_with_resource_using_bootstrap/Sample_VS2012_FSharp_ConsoleApp_net45/Sample_VS2012_FSharp_ConsoleApp_net45.fsproj
+++ b/tests/projects/Sample_VS2012_FSharp_ConsoleApp_net45_with_resource_using_bootstrap/Sample_VS2012_FSharp_ConsoleApp_net45/Sample_VS2012_FSharp_ConsoleApp_net45.fsproj
@@ -16,6 +16,7 @@
 		<TargetFSharpCoreVersion>4.4.0.0</TargetFSharpCoreVersion>
 		<LkgPath>$(MSBuildProjectDirectory)\..\..\..\..\packages\FSharp.Compiler.Tools\tools</LkgPath>
 		<LkgPath>$(MSBuildProjectDirectory)\..\..\..\..\packages\FSharp.Compiler.Tools.4.1.5\tools</LkgPath>
+		<LkgPath>$(MSBuildProjectDirectory)\..\..\..\..\packages\FSharp.Compiler.Tools.4.1.27\tools</LkgPath>
 	</PropertyGroup>
 	<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
 		<DebugSymbols>True</DebugSymbols>
diff --git a/tests/service/data/DifferingOutputDir/Dir1/Test1.fsproj b/tests/service/data/DifferingOutputDir/Dir1/Test1.fsproj
index 5a43b0c04cf..c63d10731da 100644
--- a/tests/service/data/DifferingOutputDir/Dir1/Test1.fsproj
+++ b/tests/service/data/DifferingOutputDir/Dir1/Test1.fsproj
@@ -48,7 +48,7 @@
     <Compile Include="Test1File2.fs" />
     <Compile Include="Test1File1.fs" />
   </ItemGroup>
-  <Import Project="..\..\..\..\..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets" />
+  <Import Project="..\..\..\..\..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets" />
   <Choose>
     <When Condition="($(TargetFrameworkIdentifier) == '.NETStandard' And $(TargetFrameworkVersion) == 'v1.6') Or ($(TargetFrameworkIdentifier) == '.NETCoreApp' And $(TargetFrameworkVersion) == 'v1.0') Or ($(TargetFrameworkIdentifier) == '.NETFramework' And $(TargetFrameworkVersion) == 'v4.5')">
       <ItemGroup>
diff --git a/tests/service/data/DifferingOutputDir/Dir2/Test2.fsproj b/tests/service/data/DifferingOutputDir/Dir2/Test2.fsproj
index d426b465970..0ee82b31cbf 100644
--- a/tests/service/data/DifferingOutputDir/Dir2/Test2.fsproj
+++ b/tests/service/data/DifferingOutputDir/Dir2/Test2.fsproj
@@ -54,7 +54,7 @@
       <Name>Test1</Name>
     </ProjectReference>
   </ItemGroup>
-  <Import Project="..\..\..\..\..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets" />
+  <Import Project="..\..\..\..\..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets" />
   <Choose>
     <When Condition="($(TargetFrameworkIdentifier) == '.NETStandard' And $(TargetFrameworkVersion) == 'v1.6') Or ($(TargetFrameworkIdentifier) == '.NETCoreApp' And $(TargetFrameworkVersion) == 'v1.0') Or ($(TargetFrameworkIdentifier) == '.NETFramework' And $(TargetFrameworkVersion) == 'v4.5')">
       <ItemGroup>
diff --git a/tests/service/data/FsAndFsiFiles.fsproj b/tests/service/data/FsAndFsiFiles.fsproj
index 676918f28f1..95b10fad1bb 100644
--- a/tests/service/data/FsAndFsiFiles.fsproj
+++ b/tests/service/data/FsAndFsiFiles.fsproj
@@ -48,7 +48,7 @@
 	<Compile Include="Test1File0.fsi" />
 	<Compile Include="Test1File0.fs" />
   </ItemGroup>
-  <Import Project="..\..\..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets" />
+  <Import Project="..\..\..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets" />
   <Choose>
     <When Condition="($(TargetFrameworkIdentifier) == '.NETStandard' And $(TargetFrameworkVersion) == 'v1.6') Or ($(TargetFrameworkIdentifier) == '.NETCoreApp' And $(TargetFrameworkVersion) == 'v1.0') Or ($(TargetFrameworkIdentifier) == '.NETFramework' And $(TargetFrameworkVersion) == 'v4.5')">
       <ItemGroup>
diff --git a/tests/service/data/MultiLanguageProject/ConsoleApplication1.fsproj b/tests/service/data/MultiLanguageProject/ConsoleApplication1.fsproj
index 7ab56a77349..e12ade0ff46 100644
--- a/tests/service/data/MultiLanguageProject/ConsoleApplication1.fsproj
+++ b/tests/service/data/MultiLanguageProject/ConsoleApplication1.fsproj
@@ -64,7 +64,7 @@
   <PropertyGroup>
     <MinimumVisualStudioVersion Condition="'$(MinimumVisualStudioVersion)' == ''">11</MinimumVisualStudioVersion>
   </PropertyGroup>
-  <Import Project="..\..\..\..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets" />
+  <Import Project="..\..\..\..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets" />
   <Choose>
     <When Condition="($(TargetFrameworkIdentifier) == '.NETStandard' And $(TargetFrameworkVersion) == 'v1.6') Or ($(TargetFrameworkIdentifier) == '.NETCoreApp' And $(TargetFrameworkVersion) == 'v1.0') Or ($(TargetFrameworkIdentifier) == '.NETFramework' And $(TargetFrameworkVersion) == 'v4.5')">
       <ItemGroup>
diff --git a/tests/service/data/MultiLanguageProject/ConsoleApplication2.fsproj b/tests/service/data/MultiLanguageProject/ConsoleApplication2.fsproj
index cf8ada0c37f..38bb936cab8 100644
--- a/tests/service/data/MultiLanguageProject/ConsoleApplication2.fsproj
+++ b/tests/service/data/MultiLanguageProject/ConsoleApplication2.fsproj
@@ -56,7 +56,7 @@
       <Private>True</Private>
     </ProjectReference>
   </ItemGroup>
-  <Import Project="..\..\..\..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets" />
+  <Import Project="..\..\..\..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets" />
   <Choose>
     <When Condition="($(TargetFrameworkIdentifier) == '.NETStandard' And $(TargetFrameworkVersion) == 'v1.6') Or ($(TargetFrameworkIdentifier) == '.NETCoreApp' And $(TargetFrameworkVersion) == 'v1.0') Or ($(TargetFrameworkIdentifier) == '.NETFramework' And $(TargetFrameworkVersion) == 'v4.5')">
       <ItemGroup>
diff --git a/tests/service/data/Space in name.fsproj b/tests/service/data/Space in name.fsproj
index 5e5f5607140..ec67bc97427 100644
--- a/tests/service/data/Space in name.fsproj	
+++ b/tests/service/data/Space in name.fsproj	
@@ -52,7 +52,7 @@
       <Name>Test1</Name>
     </ProjectReference>
   </ItemGroup>
-  <Import Project="..\..\..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets" />
+  <Import Project="..\..\..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets" />
   <Choose>
     <When Condition="($(TargetFrameworkIdentifier) == '.NETStandard' And $(TargetFrameworkVersion) == 'v1.6') Or ($(TargetFrameworkIdentifier) == '.NETCoreApp' And $(TargetFrameworkVersion) == 'v1.0') Or ($(TargetFrameworkIdentifier) == '.NETFramework' And $(TargetFrameworkVersion) == 'v4.5')">
       <ItemGroup>
diff --git a/tests/service/data/Test1.fsproj b/tests/service/data/Test1.fsproj
index 853a0b25db2..6cb171ba604 100644
--- a/tests/service/data/Test1.fsproj
+++ b/tests/service/data/Test1.fsproj
@@ -46,7 +46,7 @@
     <Compile Include="Test1File2.fs" />
     <Compile Include="Test1File1.fs" />
   </ItemGroup>
-  <Import Project="..\..\..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets" />
+  <Import Project="..\..\..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets" />
   <Choose>
     <When Condition="($(TargetFrameworkIdentifier) == '.NETStandard' And $(TargetFrameworkVersion) == 'v1.6') Or ($(TargetFrameworkIdentifier) == '.NETCoreApp' And $(TargetFrameworkVersion) == 'v1.0') Or ($(TargetFrameworkIdentifier) == '.NETFramework' And $(TargetFrameworkVersion) == 'v4.5')">
       <ItemGroup>
diff --git a/tests/service/data/Test2.fsproj b/tests/service/data/Test2.fsproj
index 2ad04efa94c..96ff7ac180f 100644
--- a/tests/service/data/Test2.fsproj
+++ b/tests/service/data/Test2.fsproj
@@ -53,7 +53,7 @@
       <Name>Test1</Name>
     </ProjectReference>
   </ItemGroup>
-  <Import Project="..\..\..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets" />
+  <Import Project="..\..\..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets" />
   <Choose>
     <When Condition="($(TargetFrameworkIdentifier) == '.NETStandard' And $(TargetFrameworkVersion) == 'v1.6') Or ($(TargetFrameworkIdentifier) == '.NETCoreApp' And $(TargetFrameworkVersion) == 'v1.0') Or ($(TargetFrameworkIdentifier) == '.NETFramework' And $(TargetFrameworkVersion) == 'v4.5')">
       <ItemGroup>
diff --git a/tests/service/data/TestProject/TestProject.fsproj b/tests/service/data/TestProject/TestProject.fsproj
index c5ec5c4ff1e..dde260ce99f 100644
--- a/tests/service/data/TestProject/TestProject.fsproj
+++ b/tests/service/data/TestProject/TestProject.fsproj
@@ -56,7 +56,7 @@
       <Private>True</Private>
     </ProjectReference>
   </ItemGroup>
-  <Import Project="..\..\..\..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets" />
+  <Import Project="..\..\..\..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets" />
   <Choose>
     <When Condition="($(TargetFrameworkIdentifier) == '.NETStandard' And $(TargetFrameworkVersion) == 'v1.6') Or ($(TargetFrameworkIdentifier) == '.NETCoreApp' And $(TargetFrameworkVersion) == 'v1.0') Or ($(TargetFrameworkIdentifier) == '.NETFramework' And $(TargetFrameworkVersion) == 'v4.5')">
       <ItemGroup>
diff --git a/tests/service/data/ToolsVersion12.fsproj b/tests/service/data/ToolsVersion12.fsproj
index 6ed8fdc84aa..92bad59c135 100644
--- a/tests/service/data/ToolsVersion12.fsproj
+++ b/tests/service/data/ToolsVersion12.fsproj
@@ -43,7 +43,7 @@
   <PropertyGroup>
     <MinimumVisualStudioVersion Condition="'$(MinimumVisualStudioVersion)' == ''">11</MinimumVisualStudioVersion>
   </PropertyGroup>
-  <Import Project="..\..\..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets" />
+  <Import Project="..\..\..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets" />
   <Choose>
     <When Condition="($(TargetFrameworkIdentifier) == '.NETStandard' And $(TargetFrameworkVersion) == 'v1.6') Or ($(TargetFrameworkIdentifier) == '.NETCoreApp' And $(TargetFrameworkVersion) == 'v1.0') Or ($(TargetFrameworkIdentifier) == '.NETFramework' And $(TargetFrameworkVersion) == 'v4.5')">
       <ItemGroup>
diff --git a/tests/service/data/TypeProviderConsole/TypeProviderConsole.fsproj b/tests/service/data/TypeProviderConsole/TypeProviderConsole.fsproj
index 4f3ea153d83..6b50e360a01 100644
--- a/tests/service/data/TypeProviderConsole/TypeProviderConsole.fsproj
+++ b/tests/service/data/TypeProviderConsole/TypeProviderConsole.fsproj
@@ -56,7 +56,7 @@
       <Private>True</Private>
     </ProjectReference>
   </ItemGroup>
-  <Import Project="..\..\..\..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets" />
+  <Import Project="..\..\..\..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets" />
   <Choose>
     <When Condition="($(TargetFrameworkIdentifier) == '.NETStandard' And $(TargetFrameworkVersion) == 'v1.6') Or ($(TargetFrameworkIdentifier) == '.NETCoreApp' And $(TargetFrameworkVersion) == 'v1.0') Or ($(TargetFrameworkIdentifier) == '.NETFramework' And $(TargetFrameworkVersion) == 'v4.5')">
       <ItemGroup>
diff --git a/tests/service/data/TypeProviderLibrary/TypeProviderLibrary.fsproj b/tests/service/data/TypeProviderLibrary/TypeProviderLibrary.fsproj
index ae00627abad..baa89f49b39 100644
--- a/tests/service/data/TypeProviderLibrary/TypeProviderLibrary.fsproj
+++ b/tests/service/data/TypeProviderLibrary/TypeProviderLibrary.fsproj
@@ -44,5 +44,5 @@
     <Reference Include="System.Core" />
     <Reference Include="System.Numerics" />
   </ItemGroup>
-  <Import Project="..\..\..\..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets" />
+  <Import Project="..\..\..\..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets" />
 </Project>
\ No newline at end of file
diff --git a/tests/service/data/TypeProvidersBug/TestConsole/TestConsole.fsproj b/tests/service/data/TypeProvidersBug/TestConsole/TestConsole.fsproj
index 9af97c851b7..54448fef5c3 100644
--- a/tests/service/data/TypeProvidersBug/TestConsole/TestConsole.fsproj
+++ b/tests/service/data/TypeProvidersBug/TestConsole/TestConsole.fsproj
@@ -60,5 +60,5 @@
       <Private>True</Private>
     </Reference>
   </ItemGroup>
-  <Import Project="..\..\..\..\..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets" />
+  <Import Project="..\..\..\..\..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets" />
 </Project>
\ No newline at end of file
diff --git a/tests/service/data/TypeProvidersBug/TypeProvidersBug/TypeProvidersBug.fsproj b/tests/service/data/TypeProvidersBug/TypeProvidersBug/TypeProvidersBug.fsproj
index ab086df6a3f..00ef54f6521 100644
--- a/tests/service/data/TypeProvidersBug/TypeProvidersBug/TypeProvidersBug.fsproj
+++ b/tests/service/data/TypeProvidersBug/TypeProvidersBug/TypeProvidersBug.fsproj
@@ -50,5 +50,5 @@
       <Private>True</Private>
     </Reference>
   </ItemGroup>
-  <Import Project="..\..\..\..\..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets" />
+  <Import Project="..\..\..\..\..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets" />
 </Project>
\ No newline at end of file
diff --git a/tests/service/data/sqlite-net-spike/sqlite-net-spike.fsproj b/tests/service/data/sqlite-net-spike/sqlite-net-spike.fsproj
index 6d980b1e49a..93cc75f0024 100644
--- a/tests/service/data/sqlite-net-spike/sqlite-net-spike.fsproj
+++ b/tests/service/data/sqlite-net-spike/sqlite-net-spike.fsproj
@@ -47,7 +47,7 @@
   <ItemGroup>
     <Compile Include="Program.fs" />
   </ItemGroup>
-  <Import Project="..\..\..\..\packages\FSharp.Compiler.Tools.4.1.23\tools\Microsoft.FSharp.Targets" />
+  <Import Project="..\..\..\..\packages\FSharp.Compiler.Tools.4.1.27\tools\Microsoft.FSharp.Targets" />
   <ItemGroup>
     <None Include="packages.config" />
   </ItemGroup>