diff --git a/ports/libsimpleservo/api/Cargo.toml b/ports/libsimpleservo/api/Cargo.toml
index 0dd05e38561b..dc4241bf92cb 100644
--- a/ports/libsimpleservo/api/Cargo.toml
+++ b/ports/libsimpleservo/api/Cargo.toml
@@ -50,6 +50,7 @@ no-wgl = ["libservo/no-wgl"]
 oculusvr = ["libservo/oculusvr"]
 profilemozjs = ["libservo/profilemozjs"]
 refcell_backtrace = ["libservo/refcell_backtrace"]
-webdriver = ["libservo/webdriver"]
 uwp = ["libservo/uwp", "webxr/openxr-api"]
+vslatestinstalled = ["libservo/vslatestinstalled"]
+webdriver = ["libservo/webdriver"]
 webgl_backtrace = ["libservo/webgl_backtrace"]
diff --git a/ports/libsimpleservo/capi/Cargo.toml b/ports/libsimpleservo/capi/Cargo.toml
index 2c629587c8f3..f019848ee0be 100644
--- a/ports/libsimpleservo/capi/Cargo.toml
+++ b/ports/libsimpleservo/capi/Cargo.toml
@@ -46,5 +46,6 @@ oculusvr = ["simpleservo/oculusvr"]
 profilemozjs = ["simpleservo/profilemozjs"]
 refcell_backtrace = ["simpleservo/refcell_backtrace"]
 uwp = ["simpleservo/uwp"]
+vslatestinstalled = ["simpleservo/vslatestinstalled"]
 webdriver = ["simpleservo/webdriver"]
 webgl_backtrace = ["simpleservo/webgl_backtrace"]
diff --git a/python/servo/package_commands.py b/python/servo/package_commands.py
index a663763a3985..b4341f1af538 100644
--- a/python/servo/package_commands.py
+++ b/python/servo/package_commands.py
@@ -209,8 +209,11 @@ class PackageCommands(CommandBase):
                      default=None,
                      action='append',
                      help='Create an APPX package')
+    @CommandArgument('--ms-app-store',
+                     default=None,
+                     action='store_true')
     def package(self, release=False, dev=False, android=None, magicleap=None, debug=False,
-                debugger=None, target=None, flavor=None, maven=False, uwp=None):
+                debugger=None, target=None, flavor=None, maven=False, uwp=None, ms_app_store=False):
         if android is None:
             android = self.config["build"]["android"]
         if target and android:
@@ -234,7 +237,7 @@ def package(self, release=False, dev=False, android=None, magicleap=None, debug=
         target_dir = path.dirname(binary_path)
         if uwp:
             vs_info = self.vs_dirs()
-            build_uwp(uwp, dev, vs_info['msbuild'])
+            build_uwp(uwp, dev, vs_info['msbuild'], not ms_app_store)
         elif magicleap:
             if platform.system() not in ["Darwin"]:
                 raise Exception("Magic Leap builds are only supported on macOS.")
@@ -739,7 +742,7 @@ def call_git(cmd, **kwargs):
         return 0
 
 
-def build_uwp(platforms, dev, msbuild_dir):
+def build_uwp(platforms, dev, msbuild_dir, sign_package):
     if any(map(lambda p: p not in ['x64', 'x86', 'arm64'], platforms)):
         raise Exception("Unsupported appx platforms: " + str(platforms))
     if dev and len(platforms) > 1:
@@ -764,7 +767,8 @@ def build_uwp(platforms, dev, msbuild_dir):
         )
         build_file.close()
         # Generate an appxbundle.
-        subprocess.check_call([msbuild, "/m", build_file.name])
+        sign_package_value = "true" if sign_package else "false"
+        subprocess.check_call([msbuild, "/m", build_file.name, "/p:AppxPackageSigningEnabled=" + sign_package_value])
         os.unlink(build_file.name)
 
     print("Creating ZIP")
diff --git a/support/hololens/ServoApp/ServoApp.vcxproj b/support/hololens/ServoApp/ServoApp.vcxproj
index 86873e5dda82..4fa93f76ef6a 100644
--- a/support/hololens/ServoApp/ServoApp.vcxproj
+++ b/support/hololens/ServoApp/ServoApp.vcxproj
@@ -62,6 +62,7 @@
   </ImportGroup>
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup>
+    <PackageCertificateKeyFile>ServoApp_TemporaryKey.pfx</PackageCertificateKeyFile>
     <GenerateAppInstallerFile>False</GenerateAppInstallerFile>
     <AppxAutoIncrementPackageRevision>False</AppxAutoIncrementPackageRevision>
     <AppxBundle>Always</AppxBundle>
@@ -69,7 +70,6 @@
     <AppInstallerUpdateFrequency>1</AppInstallerUpdateFrequency>
     <AppInstallerCheckForUpdateFrequency>OnApplicationRun</AppInstallerCheckForUpdateFrequency>
     <AppxSymbolPackageEnabled>False</AppxSymbolPackageEnabled>
-    <PackageCertificateThumbprint>45A22CA001C9C6BE412BF449FBE70FEDE635831F</PackageCertificateThumbprint>
   </PropertyGroup>
   <ItemDefinitionGroup>
     <ClCompile>
diff --git a/support/hololens/ServoApp/ServoApp_TemporaryKey.pfx b/support/hololens/ServoApp/ServoApp_TemporaryKey.pfx
index 8917164b3bb5..a1224301b62b 100644
Binary files a/support/hololens/ServoApp/ServoApp_TemporaryKey.pfx and b/support/hololens/ServoApp/ServoApp_TemporaryKey.pfx differ
diff --git a/support/hololens/package.msbuild b/support/hololens/package.msbuild
index d673876c3500..8d25a8d3fd65 100644
--- a/support/hololens/package.msbuild
+++ b/support/hololens/package.msbuild
@@ -9,6 +9,6 @@
       </ConfigAndPlatform>
     </ItemGroup>
     <MSBuild Projects="%%SOLUTION%%" Targets="Build"
-             Properties="Configuration=%(ConfigAndPlatform.Identity);Platform=%(ConfigAndPlatform.Platform);AppxBundle=Always;AppxBundlePlatforms=%%PACKAGE_PLATFORMS%%;UseSubFolderForOutputDirDuringMultiPlatformBuild=false;AppxPackageSigningEnabled=false"/>
+             Properties="Configuration=%(ConfigAndPlatform.Identity);Platform=%(ConfigAndPlatform.Platform);AppxBundle=Always;AppxBundlePlatforms=%%PACKAGE_PLATFORMS%%;UseSubFolderForOutputDirDuringMultiPlatformBuild=false"/>
   </Target>
-</Project>
\ No newline at end of file
+</Project>