diff --git a/build/packages.config b/build/packages.config
index 189017052d2..6e72d2e4a3b 100644
--- a/build/packages.config
+++ b/build/packages.config
@@ -4,5 +4,5 @@
   <package id="Microsoft.Taef" version="10.60.210621002" targetFramework="native" />
   <package id="Microsoft.Internal.PGO-Helpers.Cpp" version="0.2.34" targetFramework="native" />
   <!-- This cannot be included in another project that depends on XAML (as it would be a duplicate package ID) -->
-  <package id="Microsoft.UI.Xaml" version="2.7.0" targetFramework="native" />
+  <package id="Microsoft.UI.Xaml" version="2.7.3" targetFramework="native" />
 </packages>
diff --git a/common.openconsole.props b/common.openconsole.props
index e92b42f4f9e..3b3c856c162 100644
--- a/common.openconsole.props
+++ b/common.openconsole.props
@@ -18,14 +18,14 @@
 
     This version should be tracked in all project packages.config files for projects that depend on Xaml.
     -->
-    <TerminalMUXVersion>2.7.2-prerelease.220406002</TerminalMUXVersion>
+    <TerminalMUXVersion>2.7.3-prerelease.220816001</TerminalMUXVersion>
     <!--
     For the Windows 11-specific build, we're targeting the public version of Microsoft.UI.Xaml.
     This version emits a package dependency instead of embedding the dependency in our own package.
 
     This version should be tracked in build/packages.config.
     -->
-    <TerminalMUXVersion Condition="'$(TerminalTargetWindowsVersion)'=='Win11'">2.7.1</TerminalMUXVersion>
+    <TerminalMUXVersion Condition="'$(TerminalTargetWindowsVersion)'=='Win11'">2.7.3</TerminalMUXVersion>
   </PropertyGroup>
 
 </Project>
diff --git a/dep/nuget/packages.config b/dep/nuget/packages.config
index 09b288183b3..ffa247ab5d9 100644
--- a/dep/nuget/packages.config
+++ b/dep/nuget/packages.config
@@ -10,7 +10,7 @@
   <package id="Microsoft.VCRTForwarders.140" version="1.0.4" targetFramework="native" />
   <package id="Microsoft.Internal.Windows.Terminal.ThemeHelpers" version="0.6.220404001" targetFramework="native" />
   <package id="Microsoft.VisualStudio.Setup.Configuration.Native" version="2.3.2262" targetFramework="native" developmentDependency="true" />
-  <package id="Microsoft.UI.Xaml" version="2.7.2-prerelease.220406002" targetFramework="native" />
+  <package id="Microsoft.UI.Xaml" version="2.7.3-prerelease.220816001" targetFramework="native" />
   <package id="Microsoft.Windows.ImplementationLibrary" version="1.0.220201.1" targetFramework="native" developmentDependency="true" />
 
   <!-- Managed packages -->
diff --git a/src/cascadia/CascadiaPackage/CascadiaPackage.wapproj b/src/cascadia/CascadiaPackage/CascadiaPackage.wapproj
index b5274d09103..d287e564b8d 100644
--- a/src/cascadia/CascadiaPackage/CascadiaPackage.wapproj
+++ b/src/cascadia/CascadiaPackage/CascadiaPackage.wapproj
@@ -1,7 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="15.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="..\..\..\common.openconsole.props" Condition="'$(OpenConsoleDir)'==''" />
+
+  <PropertyGroup Label="NuGet Dependencies">
+    <TerminalMUX>true</TerminalMUX>
+  </PropertyGroup>
   <Import Project="$(OpenConsoleDir)src\wap-common.build.pre.props" />
+  <Import Project="$(OpenConsoleDir)src\common.nugetversions.props" />
   <PropertyGroup Label="Configuration">
     <!--
     These two properties are very important!
@@ -164,13 +169,7 @@
   </Target>
 
   <!-- This is required to get the package dependency in the AppXManifest. -->
-  <Import Project="..\..\..\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets" Condition="Exists('..\..\..\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets')" />
-  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
-    <PropertyGroup>
-      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
-    </PropertyGroup>
-    <Error Condition="!Exists('..\..\..\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets'))" />
-  </Target>
+  <Import Project="$(OpenConsoleDir)src\common.nugetversions.targets" />
 
   <Import Project="$(SolutionDir)build\rules\CollectWildcardResources.targets" />
 </Project>
diff --git a/src/cascadia/TerminalApp/TerminalAppLib.vcxproj b/src/cascadia/TerminalApp/TerminalAppLib.vcxproj
index fbf1e051fd5..81105a6e65a 100644
--- a/src/cascadia/TerminalApp/TerminalAppLib.vcxproj
+++ b/src/cascadia/TerminalApp/TerminalAppLib.vcxproj
@@ -20,6 +20,7 @@
   <PropertyGroup Label="NuGet Dependencies">
     <TerminalCppWinrt>true</TerminalCppWinrt>
     <TerminalXamlApplicationToolkit>true</TerminalXamlApplicationToolkit>
+    <TerminalMUX>true</TerminalMUX>
   </PropertyGroup>
   <Import Project="..\..\..\common.openconsole.props" Condition="'$(OpenConsoleDir)'==''" />
   <Import Project="$(OpenConsoleDir)src\common.nugetversions.props" />
@@ -407,13 +408,6 @@
   <!-- This -must- go after cppwinrt.build.post.props because that includes many VS-provided props including appcontainer.common.props, which stomps on what cppwinrt.targets did. -->
   <Import Project="$(OpenConsoleDir)src\common.nugetversions.targets" />
 
-  <Import Project="..\..\..\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets" Condition="Exists('..\..\..\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets')" />
-  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
-    <PropertyGroup>
-      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
-    </PropertyGroup>
-    <Error Condition="!Exists('$(OpenConsoleDir)\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(OpenConsoleDir)\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets'))" />
-  </Target>
   <!--
     By default, the PRI file will contain resource paths beginning with the
     project name. Since we enabled XBF embedding, this *also* includes App.xbf.
diff --git a/src/cascadia/TerminalApp/dll/TerminalApp.vcxproj b/src/cascadia/TerminalApp/dll/TerminalApp.vcxproj
index adf113be9c6..8fe78ac8a95 100644
--- a/src/cascadia/TerminalApp/dll/TerminalApp.vcxproj
+++ b/src/cascadia/TerminalApp/dll/TerminalApp.vcxproj
@@ -15,6 +15,7 @@
   <PropertyGroup Label="NuGet Dependencies">
     <TerminalCppWinrt>true</TerminalCppWinrt>
     <TerminalXamlApplicationToolkit>true</TerminalXamlApplicationToolkit>
+    <TerminalMUX>true</TerminalMUX>
   </PropertyGroup>
   <Import Project="..\..\..\..\common.openconsole.props" Condition="'$(OpenConsoleDir)'==''" />
   <Import Project="$(OpenConsoleDir)src\common.nugetversions.props" />
@@ -92,14 +93,6 @@
     </Reference>
   </ItemGroup>
 
-  <Import Project="$(OpenConsoleDir)packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets" Condition="Exists('$(OpenConsoleDir)packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets')" />
-  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
-    <PropertyGroup>
-      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
-    </PropertyGroup>
-    <Error Condition="!Exists('$(OpenConsoleDir)\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(OpenConsoleDir)\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets'))" />
-  </Target>
-
   <ItemDefinitionGroup>
     <ClCompile>
       <AdditionalIncludeDirectories>$(OpenConsoleDir)\dep\jsoncpp\json;%(AdditionalIncludeDirectories);</AdditionalIncludeDirectories>
diff --git a/src/cascadia/TerminalSettingsEditor/Microsoft.Terminal.Settings.Editor.vcxproj b/src/cascadia/TerminalSettingsEditor/Microsoft.Terminal.Settings.Editor.vcxproj
index 8953d1e9b2a..79185314875 100644
--- a/src/cascadia/TerminalSettingsEditor/Microsoft.Terminal.Settings.Editor.vcxproj
+++ b/src/cascadia/TerminalSettingsEditor/Microsoft.Terminal.Settings.Editor.vcxproj
@@ -34,6 +34,7 @@
   </PropertyGroup>
   <PropertyGroup Label="NuGet Dependencies">
     <TerminalCppWinrt>true</TerminalCppWinrt>
+    <TerminalMUX>true</TerminalMUX>
   </PropertyGroup>
   <Import Project="..\..\..\common.openconsole.props" Condition="'$(OpenConsoleDir)'==''" />
   <Import Project="$(OpenConsoleDir)src\common.nugetversions.props" />
@@ -353,12 +354,5 @@
   <!-- This -must- go after cppwinrt.build.post.props because that includes many VS-provided props including appcontainer.common.props, which stomps on what cppwinrt.targets did. -->
   <Import Project="$(OpenConsoleDir)src\common.nugetversions.targets" />
 
-  <Import Project="..\..\..\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets" Condition="Exists('..\..\..\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets')" />
-  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
-    <PropertyGroup>
-      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
-    </PropertyGroup>
-    <Error Condition="!Exists('$(OpenConsoleDir)\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(OpenConsoleDir)\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets'))" />
-  </Target>
   <Import Project="$(SolutionDir)build\rules\CollectWildcardResources.targets" />
 </Project>
diff --git a/src/cascadia/TerminalSettingsModel/Microsoft.Terminal.Settings.ModelLib.vcxproj b/src/cascadia/TerminalSettingsModel/Microsoft.Terminal.Settings.ModelLib.vcxproj
index 21184811d31..ec115c44984 100644
--- a/src/cascadia/TerminalSettingsModel/Microsoft.Terminal.Settings.ModelLib.vcxproj
+++ b/src/cascadia/TerminalSettingsModel/Microsoft.Terminal.Settings.ModelLib.vcxproj
@@ -14,6 +14,7 @@
   <PropertyGroup Label="NuGet Dependencies">
     <TerminalCppWinrt>true</TerminalCppWinrt>
     <TerminalVisualStudioSetup>true</TerminalVisualStudioSetup>
+    <TerminalMUX>true</TerminalMUX>
   </PropertyGroup>
   <Import Project="..\..\..\common.openconsole.props" Condition="'$(OpenConsoleDir)'==''" />
   <Import Project="$(OpenConsoleDir)src\common.nugetversions.props" />
@@ -274,13 +275,6 @@
   <Import Project="$(OpenConsoleDir)src\cppwinrt.build.post.props" />
   <Import Project="$(OpenConsoleDir)src\common.nugetversions.targets" />
 
-  <Import Project="..\..\..\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets" Condition="Exists('..\..\..\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets')" />
-  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
-    <PropertyGroup>
-      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
-    </PropertyGroup>
-    <Error Condition="!Exists('$(OpenConsoleDir)\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(OpenConsoleDir)\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets'))" />
-  </Target>
   <!-- This target will take our defaults.json and stamp it into a .h file that
   we can include in the code directly. This way, we don't need to worry about
   failing to load the default settings at runtime. -->
diff --git a/src/cascadia/TerminalSettingsModel/dll/Microsoft.Terminal.Settings.Model.vcxproj b/src/cascadia/TerminalSettingsModel/dll/Microsoft.Terminal.Settings.Model.vcxproj
index 4986ae29bd8..54096753eed 100644
--- a/src/cascadia/TerminalSettingsModel/dll/Microsoft.Terminal.Settings.Model.vcxproj
+++ b/src/cascadia/TerminalSettingsModel/dll/Microsoft.Terminal.Settings.Model.vcxproj
@@ -14,6 +14,7 @@
   </PropertyGroup>
   <PropertyGroup Label="NuGet Dependencies">
     <TerminalCppWinrt>true</TerminalCppWinrt>
+    <TerminalMUX>true</TerminalMUX>
   </PropertyGroup>
   <Import Project="..\..\..\..\common.openconsole.props" Condition="'$(OpenConsoleDir)'==''" />
   <Import Project="$(OpenConsoleDir)src\common.nugetversions.props" />
@@ -105,14 +106,6 @@
     </Reference>
   </ItemGroup>
 
-  <Import Project="$(OpenConsoleDir)packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets" Condition="Exists('$(OpenConsoleDir)packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets')" />
-  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
-    <PropertyGroup>
-      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
-    </PropertyGroup>
-    <Error Condition="!Exists('$(OpenConsoleDir)\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(OpenConsoleDir)\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets'))" />
-  </Target>
-
   <ItemDefinitionGroup>
     <ClCompile>
       <AdditionalIncludeDirectories>$(OpenConsoleDir)\dep\jsoncpp\json;%(AdditionalIncludeDirectories);</AdditionalIncludeDirectories>
diff --git a/src/cascadia/WindowsTerminal/WindowsTerminal.vcxproj b/src/cascadia/WindowsTerminal/WindowsTerminal.vcxproj
index e4e6186e799..48e8a55aa30 100644
--- a/src/cascadia/WindowsTerminal/WindowsTerminal.vcxproj
+++ b/src/cascadia/WindowsTerminal/WindowsTerminal.vcxproj
@@ -21,6 +21,7 @@
     <TerminalXamlApplicationToolkit>true</TerminalXamlApplicationToolkit>
     <TerminalVCRTForwarders>true</TerminalVCRTForwarders>
     <TerminalThemeHelpers>true</TerminalThemeHelpers>
+    <TerminalMUX>true</TerminalMUX>
   </PropertyGroup>
 
   <Import Project="..\..\..\common.openconsole.props" Condition="'$(OpenConsoleDir)'==''" />
@@ -141,14 +142,6 @@
 
   <Import Project="$(OpenConsoleDir)src\cppwinrt.build.post.props" />
 
-  <Import Project="..\..\..\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets" Condition="Exists('..\..\..\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets')" />
-  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
-    <PropertyGroup>
-      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
-    </PropertyGroup>
-    <Error Condition="!Exists('..\..\..\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets'))" />
-  </Target>
-
   <!-- Override GetPackagingOutputs to roll up all our dependencies.
        This ensures that when the WAP packaging project asks what files go into
        the package, we tell it.
diff --git a/src/common.nugetversions.targets b/src/common.nugetversions.targets
index 9c902f4b7b9..55e6d959a9e 100644
--- a/src/common.nugetversions.targets
+++ b/src/common.nugetversions.targets
@@ -58,6 +58,9 @@
     <!-- VisualStudioSetup -->
     <Import Project="$(MSBuildThisFileDirectory)..\packages\Microsoft.VisualStudio.Setup.Configuration.Native.2.3.2262\build\native\Microsoft.VisualStudio.Setup.Configuration.Native.targets" Condition="'$(TerminalVisualStudioSetup)' == 'true' and Exists('$(MSBuildThisFileDirectory)..\packages\Microsoft.VisualStudio.Setup.Configuration.Native.2.3.2262\build\native\Microsoft.VisualStudio.Setup.Configuration.Native.targets')" />
 
+    <!-- WinUI (which depends on WebView2 as of 2.8.0) -->
+    <Import Project="$(MSBuildThisFileDirectory)..\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets" Condition="'$(TerminalMUX)' == 'true' and Exists('$(MSBuildThisFileDirectory)..\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets')" />
+
     <!-- WIL (so widely used that this one does not have a TerminalWIL opt-in property; it is automatic) -->
     <Import Project="$(MSBuildThisFileDirectory)..\packages\Microsoft.Windows.ImplementationLibrary.1.0.220201.1\build\native\Microsoft.Windows.ImplementationLibrary.targets" Condition="Exists('$(MSBuildThisFileDirectory)..\packages\Microsoft.Windows.ImplementationLibrary.1.0.220201.1\build\native\Microsoft.Windows.ImplementationLibrary.targets')" />
 
@@ -95,6 +98,9 @@
     <!-- VisualStudioSetup -->
     <Error Condition="'$(TerminalVisualStudioSetup)' == 'true' AND !Exists('$(MSBuildThisFileDirectory)..\packages\Microsoft.VisualStudio.Setup.Configuration.Native.2.3.2262\build\native\Microsoft.VisualStudio.Setup.Configuration.Native.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(MSBuildThisFileDirectory)..\packages\Microsoft.VisualStudio.Setup.Configuration.Native.2.3.2262\build\native\Microsoft.VisualStudio.Setup.Configuration.Native.targets'))" />
 
+    <!-- WinUI (which depends on WebView2 as of 2.8.0) -->
+    <Error Condition="'$(TerminalMUX)' == 'true' AND !Exists('$(MSBuildThisFileDirectory)..\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(MSBuildThisFileDirectory)..\packages\Microsoft.UI.Xaml.$(TerminalMUXVersion)\build\native\Microsoft.UI.Xaml.targets'))" />
+
     <!-- WIL (so widely used that this one does not have a TerminalWIL opt-in property; it is automatic) -->
     <Error Condition="!Exists('$(MSBuildThisFileDirectory)..\packages\Microsoft.Windows.ImplementationLibrary.1.0.220201.1\build\native\Microsoft.Windows.ImplementationLibrary.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(MSBuildThisFileDirectory)..\packages\Microsoft.Windows.ImplementationLibrary.1.0.220201.1\build\native\Microsoft.Windows.ImplementationLibrary.targets'))" />