diff --git a/eng/Versions.props b/eng/Versions.props
index f245f7d8a70ebc..c8ed55231d9f9d 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -123,16 +123,11 @@
     <SystemCollectionsImmutableVersion>6.0.0</SystemCollectionsImmutableVersion>
     <SystemComponentModelAnnotationsVersion>5.0.0</SystemComponentModelAnnotationsVersion>
     <SystemDataSqlClientVersion>4.8.5</SystemDataSqlClientVersion>
-    <SystemDataDataSetExtensionsVersion>4.5.0</SystemDataDataSetExtensionsVersion>
     <SystemDrawingCommonVersion>7.0.0</SystemDrawingCommonVersion>
     <SystemIOFileSystemAccessControlVersion>5.0.0</SystemIOFileSystemAccessControlVersion>
-    <SystemIOPipesAccessControlVersion>5.0.0</SystemIOPipesAccessControlVersion>
     <SystemMemoryVersion>4.5.5</SystemMemoryVersion>
     <SystemNumericsVectorsVersion>4.5.0</SystemNumericsVectorsVersion>
     <SystemReflectionMetadataVersion>6.0.1</SystemReflectionMetadataVersion>
-    <SystemReflectionEmitVersion>4.7.0</SystemReflectionEmitVersion>
-    <SystemReflectionEmitILGenerationVersion>4.7.0</SystemReflectionEmitILGenerationVersion>
-    <SystemReflectionEmitLightweightVersion>4.7.0</SystemReflectionEmitLightweightVersion>
     <SystemRuntimeInteropServicesRuntimeInformationVersion>4.3.0</SystemRuntimeInteropServicesRuntimeInformationVersion>
     <SystemSecurityAccessControlVersion>6.0.0</SystemSecurityAccessControlVersion>
     <SystemSecurityCryptographyAlgorithmsVersion>4.3.1</SystemSecurityCryptographyAlgorithmsVersion>
@@ -140,7 +135,6 @@
     <SystemSecurityCryptographyOpenSslVersion>5.0.0</SystemSecurityCryptographyOpenSslVersion>
     <SystemSecurityPrincipalWindowsVersion>5.0.0</SystemSecurityPrincipalWindowsVersion>
     <SystemSecurityPermissionsVersion>7.0.0</SystemSecurityPermissionsVersion>
-    <SystemServiceModelPrimitivesVersion>4.9.0</SystemServiceModelPrimitivesVersion>
     <SystemTextJsonVersion>8.0.0-preview.3.23162.2</SystemTextJsonVersion>
     <SystemRuntimeCompilerServicesUnsafeVersion>6.0.0</SystemRuntimeCompilerServicesUnsafeVersion>
     <SystemThreadingAccessControlVersion>7.0.0</SystemThreadingAccessControlVersion>
diff --git a/src/libraries/Microsoft.Windows.Compatibility/src/Microsoft.Windows.Compatibility.csproj b/src/libraries/Microsoft.Windows.Compatibility/src/Microsoft.Windows.Compatibility.csproj
deleted file mode 100644
index eb632d22ebceb7..00000000000000
--- a/src/libraries/Microsoft.Windows.Compatibility/src/Microsoft.Windows.Compatibility.csproj
+++ /dev/null
@@ -1,75 +0,0 @@
-<Project Sdk="Microsoft.Build.NoTargets">
-  <PropertyGroup>
-    <!-- Using a csproj extension to get the correct multi-targeting behavior. -->
-    <TargetFrameworks>$(NetCoreAppCurrent);$(NetCoreAppPrevious);$(NetCoreAppMinimum);netstandard2.1;netstandard2.0</TargetFrameworks>
-    <!-- Reference the outputs for the dependency nodes calculation. -->
-    <NoTargetsDoNotReferenceOutputAssemblies>false</NoTargetsDoNotReferenceOutputAssemblies>
-    <IsPackable>true</IsPackable>
-    <!-- This is a meta package and doesn't contain any libs. -->
-    <NoWarn>$(NoWarn);NU5128</NoWarn>
-    <PackageDescription>This Windows Compatibility Pack provides access to APIs that were previously available only for .NET Framework. It can be used from both .NET as well as .NET Standard.</PackageDescription>
-  </PropertyGroup>
-
-  <ItemGroup>
-    <ProjectReference Include="$(LibrariesProjectRoot)Microsoft.Win32.Registry.AccessControl\src\Microsoft.Win32.Registry.AccessControl.csproj" />
-    <ProjectReference Include="$(LibrariesProjectRoot)Microsoft.Win32.SystemEvents\src\Microsoft.Win32.SystemEvents.csproj" />
-    <ProjectReference Include="$(LibrariesProjectRoot)System.CodeDom\src\System.CodeDom.csproj" />
-    <ProjectReference Include="$(LibrariesProjectRoot)System.ComponentModel.Composition\src\System.ComponentModel.Composition.csproj" />
-    <ProjectReference Include="$(LibrariesProjectRoot)System.Configuration.ConfigurationManager\src\System.Configuration.ConfigurationManager.csproj" />
-    <ProjectReference Include="$(LibrariesProjectRoot)System.Data.Odbc\src\System.Data.Odbc.csproj" />
-    <ProjectReference Include="$(LibrariesProjectRoot)System.Data.OleDb\src\System.Data.OleDb.csproj" />
-    <ProjectReference Include="$(LibrariesProjectRoot)System.Diagnostics.EventLog\src\System.Diagnostics.EventLog.csproj" />
-    <ProjectReference Include="$(LibrariesProjectRoot)System.Diagnostics.PerformanceCounter\src\System.Diagnostics.PerformanceCounter.csproj" />
-    <ProjectReference Include="$(LibrariesProjectRoot)System.DirectoryServices.AccountManagement\src\System.DirectoryServices.AccountManagement.csproj" />
-    <ProjectReference Include="$(LibrariesProjectRoot)System.DirectoryServices.Protocols\src\System.DirectoryServices.Protocols.csproj" />
-    <ProjectReference Include="$(LibrariesProjectRoot)System.DirectoryServices\src\System.DirectoryServices.csproj" />
-    <ProjectReference Include="$(LibrariesProjectRoot)System.IO.Packaging\src\System.IO.Packaging.csproj" />
-    <ProjectReference Include="$(LibrariesProjectRoot)System.IO.Ports\src\System.IO.Ports.csproj" />
-    <ProjectReference Include="$(LibrariesProjectRoot)System.Management\src\System.Management.csproj" />
-    <ProjectReference Include="$(LibrariesProjectRoot)System.Reflection.Context\src\System.Reflection.Context.csproj" />
-    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.Caching\src\System.Runtime.Caching.csproj" />
-    <ProjectReference Include="$(LibrariesProjectRoot)System.Security.Cryptography.Pkcs\src\System.Security.Cryptography.Pkcs.csproj" />
-    <ProjectReference Include="$(LibrariesProjectRoot)System.Security.Cryptography.ProtectedData\src\System.Security.Cryptography.ProtectedData.csproj" />
-    <ProjectReference Include="$(LibrariesProjectRoot)System.Security.Cryptography.Xml\src\System.Security.Cryptography.Xml.csproj" />
-    <ProjectReference Include="$(LibrariesProjectRoot)System.Security.Permissions\src\System.Security.Permissions.csproj" />
-    <ProjectReference Include="$(LibrariesProjectRoot)System.ServiceModel.Syndication\src\System.ServiceModel.Syndication.csproj" />
-    <ProjectReference Include="$(LibrariesProjectRoot)System.ServiceProcess.ServiceController\src\System.ServiceProcess.ServiceController.csproj" />
-    <ProjectReference Include="$(LibrariesProjectRoot)System.Speech\src\System.Speech.csproj" />
-    <ProjectReference Include="$(LibrariesProjectRoot)System.Text.Encoding.CodePages\src\System.Text.Encoding.CodePages.csproj" />
-    <ProjectReference Include="$(LibrariesProjectRoot)System.Threading.AccessControl\src\System.Threading.AccessControl.csproj" />
-  </ItemGroup>
-
-  <ItemGroup Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'netstandard2.1'))">
-    <ProjectReference Include="$(LibrariesProjectRoot)System.ComponentModel.Composition.Registration\src\System.ComponentModel.Composition.Registration.csproj" />
-  </ItemGroup>
-
-  <ItemGroup>
-    <PackageReference Include="System.Drawing.Common" Version="$(SystemDrawingCommonVersion)" />
-    <PackageReference Include="System.Data.SqlClient" Version="$(SystemDataSqlClientVersion)" />  
-    <PackageReference Include="System.ServiceModel.Primitives;
-                                     System.ServiceModel.Duplex;
-                                     System.ServiceModel.Http;
-                                     System.ServiceModel.NetTcp;
-                                     System.ServiceModel.Security;
-                                     System.Web.Services.Description"
-                      Version="$(SystemServiceModelPrimitivesVersion)" />
-  </ItemGroup>
-
-  <!-- Packages which are inbox on frameworks newer than .NET Standard 2.0. -->
-  <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
-    <PackageReference Include="System.Reflection.Emit" Version="$(SystemReflectionEmitVersion)" />
-    <PackageReference Include="System.Reflection.Emit.ILGeneration" Version="$(SystemReflectionEmitILGenerationVersion)" />
-    <PackageReference Include="System.Reflection.Emit.Lightweight" Version="$(SystemReflectionEmitLightweightVersion)" />
-  </ItemGroup>
-
-  <!-- Packages which are inbox in NET6 and shouldn't and can't be referenced anymore. -->
-  <ItemGroup Condition="'$(TargetFrameworkIdentifier)' != '.NETCoreApp'">
-    <PackageReference Include="Microsoft.Win32.Registry" Version="$(MicrosoftWin32RegistryVersion)" />
-    <PackageReference Include="System.Data.DataSetExtensions" Version="$(SystemDataDataSetExtensionsVersion)" />
-    <PackageReference Include="System.IO.FileSystem.AccessControl" Version="$(SystemIOFileSystemAccessControlVersion)" />
-    <PackageReference Include="System.IO.Pipes.AccessControl" Version="$(SystemIOPipesAccessControlVersion)" />
-    <PackageReference Include="System.Security.AccessControl" Version="$(SystemSecurityAccessControlVersion)" />
-    <PackageReference Include="System.Security.Cryptography.Cng" Version="$(SystemSecurityCryptographyCngVersion)" />
-    <PackageReference Include="System.Security.Principal.Windows" Version="$(SystemSecurityPrincipalWindowsVersion)" />
-  </ItemGroup>
-</Project>
diff --git a/src/libraries/oob-all.proj b/src/libraries/oob-all.proj
index 9164a5846ceb4e..98c6c395412507 100644
--- a/src/libraries/oob-all.proj
+++ b/src/libraries/oob-all.proj
@@ -15,13 +15,11 @@
 
     <!-- Build these packages in the allconfigurations leg only. -->
     <ProjectReference Remove="Microsoft.Internal.Runtime.AspNetCore.Transport\src\Microsoft.Internal.Runtime.AspNetCore.Transport.proj;
-                              Microsoft.Internal.Runtime.WindowsDesktop.Transport\src\Microsoft.Internal.Runtime.WindowsDesktop.Transport.proj;
-                              Microsoft.Windows.Compatibility\src\Microsoft.Windows.Compatibility.csproj"
+                              Microsoft.Internal.Runtime.WindowsDesktop.Transport\src\Microsoft.Internal.Runtime.WindowsDesktop.Transport.proj"
                       Condition="'$(BuildAllConfigurations)' != 'true'" />
 
     <!-- Skip these projects during source-build as they rely on external prebuilts. -->
-    <ProjectReference Remove="Microsoft.Extensions.DependencyInjection.Specification.Tests\src\Microsoft.Extensions.DependencyInjection.Specification.Tests.csproj;
-                              Microsoft.Windows.Compatibility\src\Microsoft.Windows.Compatibility.csproj"
+    <ProjectReference Remove="Microsoft.Extensions.DependencyInjection.Specification.Tests\src\Microsoft.Extensions.DependencyInjection.Specification.Tests.csproj"
                       Condition="'$(DotNetBuildFromSource)' == 'true'" />
 
     <!-- During an official build, build the identity package only in the allconfigurations build, otherwise always. -->
diff --git a/src/libraries/oob-src.proj b/src/libraries/oob-src.proj
index ccdaf0c39a38e9..5eb6a2f74e41b9 100644
--- a/src/libraries/oob-src.proj
+++ b/src/libraries/oob-src.proj
@@ -25,10 +25,9 @@
 
     <!-- Don't build meta-projects in the NetCoreAppCurrent vertical. -->
     <ProjectReference Remove="Microsoft.Internal.Runtime.AspNetCore.Transport\src\Microsoft.Internal.Runtime.AspNetCore.Transport.proj;
-                              Microsoft.Internal.Runtime.WindowsDesktop.Transport\src\Microsoft.Internal.Runtime.WindowsDesktop.Transport.proj;
-                              Microsoft.Windows.Compatibility\src\Microsoft.Windows.Compatibility.csproj" />
+                              Microsoft.Internal.Runtime.WindowsDesktop.Transport\src\Microsoft.Internal.Runtime.WindowsDesktop.Transport.proj" />
 
-    <!-- Filter out projects which aren't source-buildable. -->
+    <!-- Skip these projects during source-build as they rely on external prebuilts. -->
     <ProjectReference Remove="Microsoft.Extensions.DependencyInjection.Specification.Tests\src\Microsoft.Extensions.DependencyInjection.Specification.Tests.csproj"
                       Condition="'$(DotNetBuildFromSource)' == 'true'" />
   </ItemGroup>