diff --git a/change/react-native-windows-2019-10-23-09-22-00-ReactApplication.json b/change/react-native-windows-2019-10-23-09-22-00-ReactApplication.json
new file mode 100644
index 00000000000..7a8208be482
--- /dev/null
+++ b/change/react-native-windows-2019-10-23-09-22-00-ReactApplication.json
@@ -0,0 +1,9 @@
+{
+  "type": "none",
+  "comment": "Removed MainReactNativeHost from samples and use ReactApplication properties instead.",
+  "packageName": "react-native-windows",
+  "email": "vmorozov@microsoft.com",
+  "commit": "4562d6f570094dd439e7d5be225ffc11141c14c0",
+  "date": "2019-10-23T16:21:59.944Z",
+  "file": "c:\\git\\vmoroz\\react-native-windows\\change\\react-native-windows-2019-10-23-09-22-00-ReactApplication.json"
+}
\ No newline at end of file
diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/App.cpp b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/App.cpp
index af177b6933b..0b506929313 100644
--- a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/App.cpp
+++ b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/App.cpp
@@ -4,23 +4,26 @@
 #include "pch.h"
 
 #include "App.h"
+#include "ReactPackageProvider.h"
+#include "winrt/SampleLibraryCPP.h"
+#include "winrt/SampleLibraryCS.h"
 
-using namespace winrt;
-using namespace Windows::ApplicationModel;
-using namespace Windows::ApplicationModel::Activation;
-using namespace Windows::Foundation;
-using namespace Windows::UI::Xaml;
-using namespace Windows::UI::Xaml::Controls;
-using namespace Windows::UI::Xaml::Navigation;
-using namespace SampleApp;
-using namespace SampleApp::implementation;
+namespace winrt::SampleApp::implementation {
 
 /// <summary>
 /// Initializes the singleton application object.  This is the first line of
 /// authored code executed, and as such is the logical equivalent of main() or
 /// WinMain().
 /// </summary>
-App::App() {
+App::App() noexcept {
+  MainComponentName(L"SampleApp");
+  JavaScriptMainModuleName(L"index.windows");
+
+  PackageProviders().Append(
+      make<ReactPackageProvider>()); // Includes all modules in this project
+  PackageProviders().Append(winrt::SampleLibraryCPP::ReactPackageProvider());
+  PackageProviders().Append(winrt::SampleLibraryCS::ReactPackageProvider());
+
   InitializeComponent();
 
   // This works around a cpp/winrt bug with composable/aggregable types tracked
@@ -28,3 +31,5 @@ App::App() {
   AddRef();
   m_inner.as<::IUnknown>()->Release();
 }
+
+} // namespace winrt::SampleApp::implementation
diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/App.h b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/App.h
index 0d76a712540..9caf8d1499c 100644
--- a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/App.h
+++ b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/App.h
@@ -1,25 +1,13 @@
-#pragma once
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
+#pragma once
 
 #include "App.xaml.g.h"
 
-#include "MainReactNativeHost.h"
-
 namespace winrt::SampleApp::implementation {
-struct App : AppT<App> {
-  App();
 
-  winrt::Microsoft::ReactNative::ReactNativeHost HostCore() {
-    if (m_host == nullptr) {
-      m_host =
-          winrt::make<winrt::SampleApp::implementation::MainReactNativeHost>();
-    }
-
-    return m_host;
-  }
-
- private:
-  winrt::SampleApp::MainReactNativeHost m_host{};
+struct App : AppT<App> {
+  App() noexcept;
 };
+
 } // namespace winrt::SampleApp::implementation
diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainReactNativeHost.cpp b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainReactNativeHost.cpp
deleted file mode 100644
index 0a335ba722a..00000000000
--- a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainReactNativeHost.cpp
+++ /dev/null
@@ -1,11 +0,0 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
-// Licensed under the MIT License.
-
-#include "pch.h"
-#include "MainReactNativeHost.h"
-#include "MainReactNativeHost.g.cpp"
-
-using namespace winrt;
-using namespace Windows::UI::Xaml;
-
-namespace winrt::SampleApp::implementation {}
diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainReactNativeHost.h b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainReactNativeHost.h
deleted file mode 100644
index 63b5db16e1c..00000000000
--- a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainReactNativeHost.h
+++ /dev/null
@@ -1,60 +0,0 @@
-#pragma once
-// Copyright (c) Microsoft Corporation. All rights reserved.
-// Licensed under the MIT License.
-
-#include "MainReactNativeHost.g.h"
-
-#include "ReactPackageProvider.h"
-
-#include "winrt/Microsoft.ReactNative.Bridge.h"
-
-#include "winrt/SampleLibraryCPP.h"
-#include "winrt/SampleLibraryCS.h"
-
-using namespace winrt;
-using namespace Windows::Foundation::Collections;
-using namespace Microsoft::ReactNative;
-using namespace Microsoft::ReactNative::Bridge;
-using namespace SampleLibraryCPP;
-
-namespace winrt::SampleApp::implementation {
-
-struct MainReactNativeHost : MainReactNativeHostT<MainReactNativeHost> {
-  MainReactNativeHost() {
-    auto instanceSettings = InstanceSettings();
-    instanceSettings.UseWebDebugger(
-        false); // Disabled temporarily because of issue #2877
-    instanceSettings.UseLiveReload(
-        true); // true by default in debug builds already
-    instanceSettings.UseJsi(true);
-  };
-
-  hstring MainComponentName() {
-    return L"SampleApp";
-  };
-
-  hstring JavaScriptMainModuleName() {
-    return L"index.windows";
-  };
-
-  bool UseDeveloperSupport() {
-    return true;
-  };
-
-  IVectorView<Microsoft::ReactNative::Bridge::IReactPackageProvider>
-  PackageProviders() {
-    auto packages = single_threaded_vector<
-        Microsoft::ReactNative::Bridge::IReactPackageProvider>(
-        {make<ReactPackageProvider>(),
-         winrt::SampleLibraryCPP::ReactPackageProvider(),
-         winrt::SampleLibraryCS::ReactPackageProvider()});
-    return packages.GetView();
-  };
-};
-} // namespace winrt::SampleApp::implementation
-
-namespace winrt::SampleApp::factory_implementation {
-struct MainReactNativeHost : MainReactNativeHostT<
-                                 MainReactNativeHost,
-                                 implementation::MainReactNativeHost> {};
-} // namespace winrt::SampleApp::factory_implementation
diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainReactNativeHost.idl b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainReactNativeHost.idl
deleted file mode 100644
index f41780c5c6c..00000000000
--- a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/MainReactNativeHost.idl
+++ /dev/null
@@ -1,11 +0,0 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
-// Licensed under the MIT License.
-
-namespace SampleApp
-{
-  [default_interface]
-  runtimeclass MainReactNativeHost : Microsoft.ReactNative.ReactNativeHost
-  {
-    MainReactNativeHost();
-  }
-}
diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/SampleApp.vcxproj b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/SampleApp.vcxproj
index 0560f05df7b..02d97317cef 100644
--- a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/SampleApp.vcxproj
+++ b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/SampleApp.vcxproj
@@ -106,10 +106,6 @@
   </ItemDefinitionGroup>
   <ItemGroup>
     <ClInclude Include="DebugConsole.h" />
-    <ClInclude Include="MainReactNativeHost.h">
-      <DependentUpon>MainReactNativeHost.idl</DependentUpon>
-      <SubType>Code</SubType>
-    </ClInclude>
     <ClInclude Include="ReactPackageProvider.h" />
     <ClInclude Include="pch.h" />
     <ClInclude Include="App.h">
@@ -137,10 +133,6 @@
     <Image Include="Assets\Wide310x150Logo.scale-200.png" />
   </ItemGroup>
   <ItemGroup>
-    <ClCompile Include="MainReactNativeHost.cpp">
-      <DependentUpon>MainReactNativeHost.idl</DependentUpon>
-      <SubType>Code</SubType>
-    </ClCompile>
     <ClCompile Include="ReactPackageProvider.cpp" />
     <ClCompile Include="pch.cpp">
       <PrecompiledHeader>Create</PrecompiledHeader>
@@ -154,9 +146,6 @@
     <Midl Include="App.idl">
       <DependentUpon>App.xaml</DependentUpon>
     </Midl>
-    <Midl Include="MainReactNativeHost.idl">
-      <SubType>Designer</SubType>
-    </Midl>
   </ItemGroup>
   <ItemGroup>
     <None Include="PropertySheet.props" />
diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/SampleApp.vcxproj.filters b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/SampleApp.vcxproj.filters
index 8338b16d1b6..d8c41a60df1 100644
--- a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/SampleApp.vcxproj.filters
+++ b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCPP/SampleApp.vcxproj.filters
@@ -5,7 +5,6 @@
   </ItemGroup>
   <ItemGroup>
     <Midl Include="App.idl" />
-    <Midl Include="MainReactNativeHost.idl" />
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="pch.cpp" />
diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/App.xaml.cs b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/App.xaml.cs
index c1d42eb98a0..c5a1787d81f 100644
--- a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/App.xaml.cs
+++ b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/App.xaml.cs
@@ -5,24 +5,27 @@
 
 namespace SampleApp
 {
-  /// <summary>
-  /// Provides application-specific behavior to supplement the default
-  /// Application class.
-  /// </summary>
-  sealed partial class App : ReactApplication
-  {
-    private MainReactNativeHost _host = new MainReactNativeHost();
-
     /// <summary>
-    /// Initializes the singleton application object.  This is the first line
-    /// of authored code executed, and as such is the logical equivalent of
-    /// main() or WinMain().
+    /// Provides application-specific behavior to supplement the default
+    /// Application class.
     /// </summary>
-    public App()
+    sealed partial class App : ReactApplication
     {
-      this.InitializeComponent();
-    }
+        /// <summary>
+        /// Initializes the singleton application object.  This is the first line
+        /// of authored code executed, and as such is the logical equivalent of
+        /// main() or WinMain().
+        /// </summary>
+        public App()
+        {
+            MainComponentName = "SampleApp";
+            JavaScriptMainModuleName = "index.windows";
 
-    protected override ReactNativeHost HostCore => _host;
-  }
+            PackageProviders.Add(new Microsoft.ReactNative.Managed.LocalPackageProvider()); // Includes any modules in this project
+            PackageProviders.Add(new SampleLibraryCS.ReactPackageProvider());
+            PackageProviders.Add(new SampleLibraryCPP.ReactPackageProvider());
+
+            InitializeComponent();
+        }
+    }
 }
diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/MainReactNativeHost.cs b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/MainReactNativeHost.cs
deleted file mode 100644
index 5df964dcf65..00000000000
--- a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/MainReactNativeHost.cs
+++ /dev/null
@@ -1,42 +0,0 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
-// Licensed under the MIT License.
-
-using System.Collections.Generic;
-
-using Microsoft.ReactNative;
-using Microsoft.ReactNative.Bridge;
-
-namespace SampleApp
-{
-    sealed class MainReactNativeHost : ReactNativeHost
-    {
-        public MainReactNativeHost()
-        {
-            this.InstanceSettings.UseWebDebugger = false; // Disabled temporarily because of issue #2877
-            this.InstanceSettings.UseLiveReload = true; // true by default in debug builds already
-            this.InstanceSettings.UseJsi = true;
-
-#if DEBUG
-            this.InstanceSettings.EnableDeveloperMenu = true;
-#else
-            this.InstanceSettings.EnableDeveloperMenu = false;
-#endif
-
-        }
-
-        protected override string MainComponentName => "SampleApp";
-        protected override string JavaScriptMainModuleName => "index.windows";
-
-        protected override IReadOnlyList<IReactPackageProvider> PackageProviders
-        {
-            get
-            {
-                return new IReactPackageProvider[] {
-                    new Microsoft.ReactNative.Managed.LocalPackageProvider(), // Includes any modules in this project
-                    new SampleLibraryCS.ReactPackageProvider(),
-                    new SampleLibraryCPP.ReactPackageProvider(),
-                };
-            }
-        }
-    }
-}
diff --git a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/SampleAppCS.csproj b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/SampleAppCS.csproj
index adeb72deae6..5d000363477 100644
--- a/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/SampleAppCS.csproj
+++ b/packages/microsoft-reactnative-sampleapps/windows/SampleAppCS/SampleAppCS.csproj
@@ -120,7 +120,6 @@
       <DependentUpon>App.xaml</DependentUpon>
     </Compile>
     <Compile Include="DebugConsole.cs" />
-    <Compile Include="MainReactNativeHost.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>
   <ItemGroup>
diff --git a/vnext/Microsoft.ReactNative/ReactApplication.cpp b/vnext/Microsoft.ReactNative/ReactApplication.cpp
index f3acc65b133..1b9d08bbdb6 100644
--- a/vnext/Microsoft.ReactNative/ReactApplication.cpp
+++ b/vnext/Microsoft.ReactNative/ReactApplication.cpp
@@ -3,11 +3,12 @@
 
 #include "pch.h"
 #include "ReactApplication.h"
-#if __has_include("ReactApplication.g.cpp")
 #include "ReactApplication.g.cpp"
-#endif
 #include "ReactNativeHost.h"
 
+#include <winrt/Windows.ApplicationModel.Activation.h>
+#include <winrt/Windows.UI.Core.h>
+
 using namespace winrt;
 using namespace Microsoft::ReactNative;
 using namespace Windows::ApplicationModel;
@@ -19,8 +20,8 @@ using namespace Windows::UI::Xaml::Controls;
 using namespace Windows::UI::Xaml::Navigation;
 
 namespace winrt::Microsoft::ReactNative::implementation {
-ReactApplication::ReactApplication()
-    : m_delegate(CreateReactApplicationDelegate()) {
+
+ReactApplication::ReactApplication() noexcept {
   Suspending({this, &ReactApplication::OnSuspending});
 
 #if defined _DEBUG && \
@@ -35,17 +36,39 @@ ReactApplication::ReactApplication()
 #endif
 }
 
-Microsoft::ReactNative::ReactNativeHost ReactApplication::Host() {
-  if (m_host == nullptr) {
-    m_host = overridable().HostCore();
+Microsoft::ReactNative::ReactInstanceSettings
+ReactApplication::InstanceSettings() noexcept {
+  if (!m_instanceSettings) {
+    m_instanceSettings = make<ReactInstanceSettings>();
+    m_instanceSettings.UseWebDebugger(false);
+    m_instanceSettings.UseLiveReload(true);
+    m_instanceSettings.UseJsi(true);
+    m_instanceSettings.EnableDeveloperMenu(REACT_DEFAULT_ENABLE_DEVELOPER_MENU);
   }
 
-  return m_host;
+  return m_instanceSettings;
+}
+
+IVector<IReactPackageProvider> ReactApplication::PackageProviders() noexcept {
+  if (!m_packageProviders) {
+    m_packageProviders = single_threaded_vector<IReactPackageProvider>();
+  }
+
+  return m_packageProviders;
 }
 
-Microsoft::ReactNative::ReactNativeHost ReactApplication::HostCore() {
-  throw hresult_not_implemented(
-      L"You must implement ReactApplication.HostCore.");
+Microsoft::ReactNative::ReactNativeHost ReactApplication::Host() noexcept {
+  if (!m_host) {
+    m_host = make<ReactNativeHost>();
+    m_host.InstanceSettings(InstanceSettings());
+    m_host.PackageProviders(PackageProviders());
+    m_host.MainComponentName(MainComponentName());
+    m_host.UseDeveloperSupport(UseDeveloperSupport());
+    m_host.JavaScriptMainModuleName(JavaScriptMainModuleName());
+    m_host.JavaScriptBundleFile(JavaScriptBundleFile());
+  }
+
+  return m_host;
 }
 
 void ReactApplication::OnLaunched(LaunchActivatedEventArgs const &e) {
@@ -61,6 +84,10 @@ void ReactApplication::OnLaunched(LaunchActivatedEventArgs const &e) {
 /// </summary>
 /// <param name="e">Details about the launch request and process.</param>
 void ReactApplication::OnCreate(LaunchActivatedEventArgs const &e) {
+  if (!m_delegate) {
+    m_delegate = CreateReactApplicationDelegate();
+  }
+
 #if defined _DEBUG
   if (IsDebuggerPresent()) {
     this->DebugSettings().EnableFrameRateCounter(TRUE);
@@ -145,4 +172,10 @@ void ReactApplication::OnNavigationFailed(
   throw hresult_error(
       E_FAIL, hstring(L"Failed to load Page ") + e.SourcePageType().Name);
 }
+
+ReactApplicationDelegate __stdcall ReactApplication::
+    CreateReactApplicationDelegate() {
+  return winrt::Microsoft::ReactNative::ReactApplicationDelegate(*this);
+}
+
 } // namespace winrt::Microsoft::ReactNative::implementation
diff --git a/vnext/Microsoft.ReactNative/ReactApplication.h b/vnext/Microsoft.ReactNative/ReactApplication.h
index 056340e58d3..13541ec74cb 100644
--- a/vnext/Microsoft.ReactNative/ReactApplication.h
+++ b/vnext/Microsoft.ReactNative/ReactApplication.h
@@ -1,48 +1,123 @@
-#pragma once
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
+#pragma once
 
 #include "ReactApplication.g.h"
 #include "ReactNativeHost.h"
 
-#include <winrt/Windows.ApplicationModel.Activation.h>
-#include <winrt/Windows.UI.Core.h>
-
 using namespace winrt;
 using namespace Windows::ApplicationModel;
 using namespace Windows::UI::Xaml::Navigation;
+using namespace Microsoft::ReactNative;
+using namespace Microsoft::ReactNative::Bridge;
+using namespace Windows::Foundation::Collections;
 
 namespace winrt::Microsoft::ReactNative::implementation {
+
 struct ReactApplication : ReactApplicationT<ReactApplication> {
-  ReactApplication();
+  ReactApplication() noexcept;
 
-  Microsoft::ReactNative::ReactNativeHost Host();
+  Microsoft::ReactNative::ReactInstanceSettings InstanceSettings() noexcept;
+  void InstanceSettings(
+      Microsoft::ReactNative::ReactInstanceSettings const &value) noexcept;
 
-  virtual Microsoft::ReactNative::ReactNativeHost HostCore();
+  IVector<IReactPackageProvider> PackageProviders() noexcept;
+  void PackageProviders(IVector<IReactPackageProvider> const &value) noexcept;
 
-  virtual void OnLaunched(Activation::LaunchActivatedEventArgs const &);
+  hstring MainComponentName() noexcept;
+  void MainComponentName(hstring const &value) noexcept;
 
-  virtual void OnSuspending(IInspectable const &, SuspendingEventArgs const &);
+  bool UseDeveloperSupport() noexcept;
+  void UseDeveloperSupport(bool value) noexcept;
+
+  hstring JavaScriptMainModuleName() noexcept;
+  void JavaScriptMainModuleName(hstring const &value) noexcept;
+
+  hstring JavaScriptBundleFile() noexcept;
+  void JavaScriptBundleFile(hstring const &value) noexcept;
 
+  Microsoft::ReactNative::ReactNativeHost Host() noexcept;
+
+  virtual void OnLaunched(Activation::LaunchActivatedEventArgs const &);
+  virtual void OnSuspending(IInspectable const &, SuspendingEventArgs const &);
   virtual void OnNavigationFailed(
       IInspectable const &,
       NavigationFailedEventArgs const &);
 
  protected:
-  virtual winrt::Microsoft::ReactNative::
-      ReactApplicationDelegate __stdcall CreateReactApplicationDelegate() {
-    return winrt::Microsoft::ReactNative::ReactApplicationDelegate(*this);
-  }
+  virtual ReactApplicationDelegate __stdcall CreateReactApplicationDelegate();
 
  private:
+  Microsoft::ReactNative::ReactInstanceSettings m_instanceSettings{nullptr};
+  IVector<IReactPackageProvider> m_packageProviders{nullptr};
+  hstring m_mainComponentName;
+  bool m_useDeveloperSupport{REACT_DEFAULT_USE_DEVELOPER_SUPPORT};
+  hstring m_javaScriptMainModuleName;
+  hstring m_javaScriptBundleFile;
   Microsoft::ReactNative::ReactNativeHost m_host{nullptr};
-  Microsoft::ReactNative::ReactApplicationDelegate m_delegate{nullptr};
+
+  ReactApplicationDelegate m_delegate{nullptr};
 
   void OnCreate(Activation::LaunchActivatedEventArgs const &e);
 };
+
 } // namespace winrt::Microsoft::ReactNative::implementation
 
 namespace winrt::Microsoft::ReactNative::factory_implementation {
+
 struct ReactApplication
     : ReactApplicationT<ReactApplication, implementation::ReactApplication> {};
+
 } // namespace winrt::Microsoft::ReactNative::factory_implementation
+
+namespace winrt::Microsoft::ReactNative::implementation {
+
+//=============================================================================
+// ReactApplication inline implementation
+//=============================================================================
+
+inline void ReactApplication::InstanceSettings(
+    Microsoft::ReactNative::ReactInstanceSettings const &value) noexcept {
+  m_instanceSettings = value;
+}
+
+inline void ReactApplication::PackageProviders(
+    IVector<IReactPackageProvider> const &value) noexcept {
+  m_packageProviders = value;
+}
+
+inline hstring ReactApplication::MainComponentName() noexcept {
+  return m_mainComponentName;
+}
+
+inline void ReactApplication::MainComponentName(hstring const &value) noexcept {
+  m_mainComponentName = value;
+}
+
+inline bool ReactApplication::UseDeveloperSupport() noexcept {
+  return m_useDeveloperSupport;
+}
+
+inline void ReactApplication::UseDeveloperSupport(bool value) noexcept {
+  m_useDeveloperSupport = value;
+}
+
+inline hstring ReactApplication::JavaScriptMainModuleName() noexcept {
+  return m_javaScriptMainModuleName;
+}
+
+inline void ReactApplication::JavaScriptMainModuleName(
+    hstring const &value) noexcept {
+  m_javaScriptMainModuleName = value;
+}
+
+inline hstring ReactApplication::JavaScriptBundleFile() noexcept {
+  return m_javaScriptBundleFile;
+}
+
+inline void ReactApplication::JavaScriptBundleFile(
+    hstring const &value) noexcept {
+  m_javaScriptBundleFile = value;
+}
+
+} // namespace winrt::Microsoft::ReactNative::implementation
diff --git a/vnext/Microsoft.ReactNative/ReactApplication.idl b/vnext/Microsoft.ReactNative/ReactApplication.idl
index 0a0f4a46ba9..a778c4f7ec7 100644
--- a/vnext/Microsoft.ReactNative/ReactApplication.idl
+++ b/vnext/Microsoft.ReactNative/ReactApplication.idl
@@ -6,17 +6,21 @@ import "ReactApplicationDelegate.idl";
 
 namespace Microsoft.ReactNative
 {
-	interface IReactApplication
-	{
-		ReactNativeHost Host{ get; };
-	};
+    [webhosthidden]
+    [default_interface]
+    unsealed runtimeclass ReactApplication : Windows.UI.Xaml.Application
+    {
+        ReactApplication();
+     
+        ReactInstanceSettings InstanceSettings { get; set; };
+     
+        IVector<Microsoft.ReactNative.Bridge.IReactPackageProvider> PackageProviders { get; set; };
+     
+        String MainComponentName { get; set; };
+        Boolean UseDeveloperSupport { get; set; };
+        String JavaScriptMainModuleName { get; set; };
+        String JavaScriptBundleFile { get; set; };
 
-	[webhosthidden]
-	[default_interface]
-	unsealed runtimeclass ReactApplication : Windows.UI.Xaml.Application, IReactApplication
-	{
-		ReactApplication();
-
-		overridable ReactNativeHost HostCore{ get; };
-	};
-}
+        ReactNativeHost Host { get; };
+    };
+} // namespace Microsoft.ReactNative
diff --git a/vnext/Microsoft.ReactNative/ReactApplicationDelegate.h b/vnext/Microsoft.ReactNative/ReactApplicationDelegate.h
index daf04bbafbf..cf67db74c6e 100644
--- a/vnext/Microsoft.ReactNative/ReactApplicationDelegate.h
+++ b/vnext/Microsoft.ReactNative/ReactApplicationDelegate.h
@@ -3,7 +3,6 @@
 // Licensed under the MIT License.
 
 #include "ReactApplicationDelegate.g.h"
-#include "ReactApplication.h"
 
 using namespace winrt;
 using namespace Windows::UI::Xaml;
diff --git a/vnext/Microsoft.ReactNative/ReactNativeHost.cpp b/vnext/Microsoft.ReactNative/ReactNativeHost.cpp
index 0254db326a9..03e5028b191 100644
--- a/vnext/Microsoft.ReactNative/ReactNativeHost.cpp
+++ b/vnext/Microsoft.ReactNative/ReactNativeHost.cpp
@@ -20,12 +20,41 @@ using namespace Windows::UI::Xaml;
 using namespace Windows::UI::Xaml::Controls;
 
 namespace winrt::Microsoft::ReactNative::implementation {
-ReactNativeHost::ReactNativeHost() {
+
+ReactNativeHost::ReactNativeHost() noexcept {
   Init();
 }
 
+void ReactNativeHost::Init() noexcept {
+#if _DEBUG
+  facebook::react::InitializeLogging(
+      [](facebook::react::RCTLogLevel /*logLevel*/, const char *message) {
+        std::string str = std::string("ReactNative:") + message;
+        OutputDebugStringA(str.c_str());
+      });
+#endif
+}
+
 Microsoft::ReactNative::ReactInstanceManager
-ReactNativeHost::ReactInstanceManager() {
+ReactNativeHost::CreateReactInstanceManager() noexcept {
+  auto builder = ReactInstanceManagerBuilder();
+  builder.InstanceSettings(InstanceSettings());
+  builder.UseDeveloperSupport(UseDeveloperSupport());
+  builder.InitialLifecycleState(LifecycleState::BeforeCreate);
+  builder.JavaScriptBundleFile(JavaScriptBundleFile());
+  builder.JavaScriptMainModuleName(JavaScriptMainModuleName());
+  builder.PackageProviders(PackageProviders().GetView());
+
+  return builder.Build();
+}
+
+std::shared_ptr<ReactRootView> ReactNativeHost::CreateRootView() noexcept {
+  auto rootView = std::make_shared<ReactRootView>();
+  return rootView;
+}
+
+Microsoft::ReactNative::ReactInstanceManager
+ReactNativeHost::ReactInstanceManager() noexcept {
   if (m_reactInstanceManager == nullptr) {
     m_reactInstanceManager = CreateReactInstanceManager();
   }
@@ -33,9 +62,11 @@ ReactNativeHost::ReactInstanceManager() {
   return m_reactInstanceManager;
 }
 
-UIElement ReactNativeHost::GetOrCreateRootView(IInspectable initialProps) {
-  if (m_reactRootView != nullptr)
+UIElement ReactNativeHost::GetOrCreateRootView(
+    IInspectable initialProps) noexcept {
+  if (m_reactRootView != nullptr) {
     return *m_reactRootView;
+  }
 
   folly::dynamic props =
       Microsoft::ReactNative::Bridge::ConvertToDynamic(initialProps);
@@ -45,96 +76,56 @@ UIElement ReactNativeHost::GetOrCreateRootView(IInspectable initialProps) {
 
   m_reactRootView->OnCreate(*this);
   m_reactRootView->StartReactApplicationAsync(
-      ReactInstanceManager(), get_MainComponentName(), props);
+      ReactInstanceManager(), MainComponentName(), props);
 
   return *m_reactRootView;
 }
 
-void ReactNativeHost::OnSuspend() {
+auto ReactNativeHost::InstanceSettings() noexcept
+    -> Microsoft::ReactNative::ReactInstanceSettings {
+  if (!m_instanceSettings) {
+    m_instanceSettings = make<ReactInstanceSettings>();
+    m_instanceSettings.UseWebDebugger(false);
+    m_instanceSettings.UseLiveReload(true);
+    m_instanceSettings.UseJsi(true);
+    m_instanceSettings.EnableDeveloperMenu(REACT_DEFAULT_ENABLE_DEVELOPER_MENU);
+  }
+
+  return m_instanceSettings;
+}
+
+auto ReactNativeHost::PackageProviders() noexcept
+    -> IVector<IReactPackageProvider> {
+  if (!m_packageProviders) {
+    m_packageProviders = single_threaded_vector<IReactPackageProvider>();
+  }
+
+  return m_packageProviders;
+}
+
+void ReactNativeHost::OnSuspend() noexcept {
   if (HasInstance()) {
     ReactInstanceManager().OnSuspend();
   }
 }
 
-void ReactNativeHost::OnEnteredBackground() {
+void ReactNativeHost::OnEnteredBackground() noexcept {
   if (HasInstance()) {
     ReactInstanceManager().OnEnteredBackground();
   }
 }
 
-void ReactNativeHost::OnLeavingBackground() {
+void ReactNativeHost::OnLeavingBackground() noexcept {
   if (HasInstance()) {
     ReactInstanceManager().OnLeavingBackground();
   }
 }
 
 void ReactNativeHost::OnResume(
-    Microsoft::ReactNative::OnResumeAction const &action) {
+    Microsoft::ReactNative::OnResumeAction const &action) noexcept {
   if (HasInstance()) {
     ReactInstanceManager().OnResume(action);
   }
 }
 
-hstring ReactNativeHost::MainComponentName() {
-  throw hresult_not_implemented(
-      L"Must implement ReactNativeHost.MainComponentName.");
-}
-
-hstring ReactNativeHost::JavaScriptMainModuleName() {
-  throw hresult_not_implemented(
-      L"Must implement ReactNativeHost.JavaScriptMainModuleName.");
-}
-
-hstring ReactNativeHost::JavaScriptBundleFile() {
-  return {};
-}
-
-bool ReactNativeHost::UseDeveloperSupport() {
-#if _DEBUG
-  return true;
-#else
-  return false;
-#endif
-}
-
-auto ReactNativeHost::PackageProviders() -> IVectorView<IReactPackageProvider> {
-  return single_threaded_vector<IReactPackageProvider>().GetView();
-}
-
-auto ReactNativeHost::InstanceSettings()
-    -> Microsoft::ReactNative::ReactInstanceSettings {
-  // Return the default
-  if (m_instanceSettings == nullptr)
-    m_instanceSettings = make<ReactInstanceSettings>();
-
-  return m_instanceSettings;
-}
-
-void ReactNativeHost::Init() {
-#if _DEBUG
-  facebook::react::InitializeLogging(
-      [](facebook::react::RCTLogLevel /*logLevel*/, const char *message) {
-        std::string str = std::string("ReactNative:") + message;
-        OutputDebugStringA(str.c_str());
-      });
-#endif
-}
-
-Microsoft::ReactNative::ReactInstanceManager
-ReactNativeHost::CreateReactInstanceManager() {
-  auto builder = ReactInstanceManagerBuilder();
-  builder.InstanceSettings(InstanceSettings());
-  builder.UseDeveloperSupport(UseDeveloperSupport());
-  builder.InitialLifecycleState(LifecycleState::BeforeCreate);
-  builder.JavaScriptBundleFile(get_JavaScriptBundleFile());
-  builder.JavaScriptMainModuleName(get_JavaScriptMainModuleName());
-  builder.PackageProviders(get_PackageProviders());
-
-  return builder.Build();
-}
-
-std::shared_ptr<ReactRootView> ReactNativeHost::CreateRootView() {
-  auto rootView = std::make_shared<ReactRootView>();
-  return rootView;
-}
 } // namespace winrt::Microsoft::ReactNative::implementation
diff --git a/vnext/Microsoft.ReactNative/ReactNativeHost.h b/vnext/Microsoft.ReactNative/ReactNativeHost.h
index e11aa7fbdf4..a0d18ba5453 100644
--- a/vnext/Microsoft.ReactNative/ReactNativeHost.h
+++ b/vnext/Microsoft.ReactNative/ReactNativeHost.h
@@ -1,6 +1,6 @@
-#pragma once
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
+#pragma once
 
 #include "ReactNativeHost.g.h"
 
@@ -17,66 +17,129 @@ using namespace Microsoft::ReactNative;
 using namespace Microsoft::ReactNative::Bridge;
 using namespace Windows::Foundation::Collections;
 
+#ifndef REACT_DEFAULT_USE_DEVELOPER_SUPPORT
+#if _DEBUG
+#define REACT_DEFAULT_USE_DEVELOPER_SUPPORT true
+#else
+#define REACT_DEFAULT_USE_DEVELOPER_SUPPORT false
+#endif // _DEBUG
+#endif // REACT_DEFAULT_USE_DEVELOPER_SUPPORT
+
+#ifndef REACT_DEFAULT_ENABLE_DEVELOPER_MENU
+#if _DEBUG
+#define REACT_DEFAULT_ENABLE_DEVELOPER_MENU true
+#else
+#define REACT_DEFAULT_ENABLE_DEVELOPER_MENU false
+#endif // _DEBUG
+#endif // REACT_DEFAULT_ENABLE_DEVELOPER_MENU
+
 namespace winrt::Microsoft::ReactNative::implementation {
 
 struct ReactNativeHost : ReactNativeHostT<ReactNativeHost> {
-  ReactNativeHost();
-
-  UIElement GetOrCreateRootView(IInspectable initialProps);
-
-  Microsoft::ReactNative::ReactInstanceManager ReactInstanceManager();
-  Microsoft::ReactNative::ReactInstanceSettings InstanceSettings();
-
-  void OnSuspend();
-  void OnEnteredBackground();
-  void OnLeavingBackground();
-  void OnResume(OnResumeAction const &action);
-
-  virtual hstring MainComponentName();
-  virtual hstring JavaScriptMainModuleName();
-  virtual hstring JavaScriptBundleFile();
-  virtual bool UseDeveloperSupport();
-  virtual IVectorView<IReactPackageProvider> PackageProviders();
-
-  bool HasInstance() {
-    return m_reactInstanceManager != nullptr;
-  }
-
-  hstring get_MainComponentName() {
-    return overridable().MainComponentName();
-  }
+  ReactNativeHost() noexcept;
+
+  UIElement GetOrCreateRootView(IInspectable initialProps) noexcept;
+
+  Microsoft::ReactNative::ReactInstanceManager ReactInstanceManager() noexcept;
+  Microsoft::ReactNative::ReactInstanceSettings InstanceSettings() noexcept;
+  void InstanceSettings(
+      Microsoft::ReactNative::ReactInstanceSettings const &value) noexcept;
+  bool HasInstance() noexcept;
+  IVector<IReactPackageProvider> PackageProviders() noexcept;
+  void PackageProviders(IVector<IReactPackageProvider> const &value) noexcept;
+  hstring MainComponentName() noexcept;
+  void MainComponentName(hstring const &value) noexcept;
+  bool UseDeveloperSupport() noexcept;
+  void UseDeveloperSupport(bool value) noexcept;
+  hstring JavaScriptMainModuleName() noexcept;
+  void JavaScriptMainModuleName(hstring const &value) noexcept;
+  hstring JavaScriptBundleFile() noexcept;
+  void JavaScriptBundleFile(hstring const &value) noexcept;
+
+  void OnSuspend() noexcept;
+  void OnEnteredBackground() noexcept;
+  void OnLeavingBackground() noexcept;
+  void OnResume(OnResumeAction const &action) noexcept;
 
-  hstring get_JavaScriptMainModuleName() {
-    return overridable().JavaScriptMainModuleName();
-  }
-
-  hstring get_JavaScriptBundleFile() {
-    return overridable().JavaScriptBundleFile();
-  }
-
-  bool get_UseDeveloperSupport() {
-    return overridable().UseDeveloperSupport();
-  }
-
-  IVectorView<IReactPackageProvider> get_PackageProviders() {
-    return overridable().PackageProviders();
-  }
+ private:
+  void Init() noexcept;
+  Microsoft::ReactNative::ReactInstanceManager
+  CreateReactInstanceManager() noexcept;
+  std::shared_ptr<ReactRootView> CreateRootView() noexcept;
 
  private:
   Microsoft::ReactNative::ReactInstanceSettings m_instanceSettings;
   Microsoft::ReactNative::ReactInstanceManager m_reactInstanceManager{nullptr};
-  hstring m_mainComponentName{};
-  hstring m_javascriptMainModuleName{};
+  IVector<IReactPackageProvider> m_packageProviders{nullptr};
+  hstring m_mainComponentName;
+  bool m_useDeveloperSupport{REACT_DEFAULT_USE_DEVELOPER_SUPPORT};
+  hstring m_javaScriptMainModuleName;
+  hstring m_javaScriptBundleFile;
 
   std::shared_ptr<ReactRootView> m_reactRootView{nullptr};
-
-  void Init();
-  Microsoft::ReactNative::ReactInstanceManager CreateReactInstanceManager();
-  std::shared_ptr<ReactRootView> CreateRootView();
 };
+
 } // namespace winrt::Microsoft::ReactNative::implementation
 
 namespace winrt::Microsoft::ReactNative::factory_implementation {
+
 struct ReactNativeHost
     : ReactNativeHostT<ReactNativeHost, implementation::ReactNativeHost> {};
+
 } // namespace winrt::Microsoft::ReactNative::factory_implementation
+
+namespace winrt::Microsoft::ReactNative::implementation {
+
+//=============================================================================
+// ReactNativeHost inline implementation
+//=============================================================================
+
+inline void ReactNativeHost::InstanceSettings(
+    Microsoft::ReactNative::ReactInstanceSettings const &value) noexcept {
+  m_instanceSettings = value;
+}
+
+inline bool ReactNativeHost::HasInstance() noexcept {
+  return m_reactInstanceManager != nullptr;
+}
+
+inline void ReactNativeHost::PackageProviders(
+    IVector<IReactPackageProvider> const &value) noexcept {
+  m_packageProviders = value;
+}
+
+inline hstring ReactNativeHost::MainComponentName() noexcept {
+  return m_mainComponentName;
+}
+
+inline void ReactNativeHost::MainComponentName(hstring const &value) noexcept {
+  m_mainComponentName = value;
+}
+
+inline bool ReactNativeHost::UseDeveloperSupport() noexcept {
+  return m_useDeveloperSupport;
+}
+
+inline void ReactNativeHost::UseDeveloperSupport(bool value) noexcept {
+  m_useDeveloperSupport = value;
+}
+
+inline hstring ReactNativeHost::JavaScriptMainModuleName() noexcept {
+  return m_javaScriptMainModuleName;
+}
+
+inline void ReactNativeHost::JavaScriptMainModuleName(
+    hstring const &value) noexcept {
+  m_javaScriptMainModuleName = value;
+}
+
+inline hstring ReactNativeHost::JavaScriptBundleFile() noexcept {
+  return m_javaScriptBundleFile;
+}
+
+inline void ReactNativeHost::JavaScriptBundleFile(
+    hstring const &value) noexcept {
+  m_javaScriptBundleFile = value;
+}
+
+} // namespace winrt::Microsoft::ReactNative::implementation
diff --git a/vnext/Microsoft.ReactNative/ReactNativeHost.idl b/vnext/Microsoft.ReactNative/ReactNativeHost.idl
index 52f129068d7..e6edc632fb5 100644
--- a/vnext/Microsoft.ReactNative/ReactNativeHost.idl
+++ b/vnext/Microsoft.ReactNative/ReactNativeHost.idl
@@ -13,21 +13,21 @@ namespace Microsoft.ReactNative
 
   [webhosthidden]
   [default_interface]
-  unsealed runtimeclass ReactNativeHost
+  runtimeclass ReactNativeHost
   {
     ReactNativeHost();
 
     ReactInstanceManager ReactInstanceManager{ get; };
-    ReactInstanceSettings InstanceSettings { get; };
+    ReactInstanceSettings InstanceSettings{ get; set; };
 
     Boolean HasInstance{ get; };
 
-    overridable IVectorView<Microsoft.ReactNative.Bridge.IReactPackageProvider> PackageProviders { get; };
+    IVector<Microsoft.ReactNative.Bridge.IReactPackageProvider> PackageProviders { get; set; };
 
-    overridable String MainComponentName{ get; };
-    overridable Boolean UseDeveloperSupport{ get; };
-    overridable String JavaScriptMainModuleName{ get; };
-    overridable String JavaScriptBundleFile{ get; };
+    String MainComponentName{ get; set; };
+    Boolean UseDeveloperSupport{ get; set; };
+    String JavaScriptMainModuleName{ get; set; };
+    String JavaScriptBundleFile{ get; set; };
 
     Windows.UI.Xaml.UIElement GetOrCreateRootView(IInspectable initialProps);
 
diff --git a/vnext/Microsoft.ReactNative/ReactRootView.cpp b/vnext/Microsoft.ReactNative/ReactRootView.cpp
index 620373911f2..12ba34f3232 100644
--- a/vnext/Microsoft.ReactNative/ReactRootView.cpp
+++ b/vnext/Microsoft.ReactNative/ReactRootView.cpp
@@ -2,9 +2,8 @@
 // Licensed under the MIT License.
 #include "pch.h"
 #include "ReactRootView.h"
-#if __has_include("ReactRootView.g.cpp")
 #include "ReactRootView.g.cpp"
-#endif
+#include <winrt/Windows.UI.Core.h>
 
 using namespace winrt;
 using namespace Windows::UI::Core;
diff --git a/vnext/Microsoft.ReactNative/ReactRootView.h b/vnext/Microsoft.ReactNative/ReactRootView.h
index 5a227b10351..544bde7571a 100644
--- a/vnext/Microsoft.ReactNative/ReactRootView.h
+++ b/vnext/Microsoft.ReactNative/ReactRootView.h
@@ -4,7 +4,6 @@
 
 #include "ReactRootView.g.h"
 
-#include "ReactApplication.h"
 #include "ReactInstanceManager.h"
 #include "ReactNativeHost.h"
 #include "ViewManagerProvider.h"
diff --git a/yarn.lock b/yarn.lock
index cb2a1402f4e..237d910031b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -9831,10 +9831,10 @@ react-is@^16.8.1, react-is@^16.8.4, react-is@^16.8.6:
   resolved "https://registry.yarnpkg.com/react-is/-/react-is-16.9.0.tgz#21ca9561399aad0ff1a7701c01683e8ca981edcb"
   integrity sha512-tJBzzzIgnnRfEm046qRcURvwQnZVXmuCbscxUO5RWrGTXpon2d4c8mI0D8WE6ydVIm29JiLB6+RslkIvym9Rjw==
 
-"react-native@https://github.com/microsoft/react-native/archive/v0.60.0-microsoft.8.tar.gz":
-  version "0.60.0-microsoft.8"
-  uid a2bd4cdb70c85ada46cea8fc3294c7e7bca5139c
-  resolved "https://github.com/microsoft/react-native/archive/v0.60.0-microsoft.8.tar.gz#a2bd4cdb70c85ada46cea8fc3294c7e7bca5139c"
+"react-native@https://github.com/microsoft/react-native/archive/v0.60.0-microsoft.9.tar.gz":
+  version "0.60.0-microsoft.9"
+  uid e3882023fd841d13833dce99dcf88eedd63a9f79
+  resolved "https://github.com/microsoft/react-native/archive/v0.60.0-microsoft.9.tar.gz#e3882023fd841d13833dce99dcf88eedd63a9f79"
   dependencies:
     "@babel/core" "^7.4.0"
     "@babel/generator" "^7.4.0"