diff --git a/.vsts-dotnet-ci.yml b/.vsts-dotnet-ci.yml
index ec62ce2431..fa7c7a139c 100644
--- a/.vsts-dotnet-ci.yml
+++ b/.vsts-dotnet-ci.yml
@@ -21,7 +21,7 @@ phases:
     name: Windows_NT
     buildScript: build.cmd
     queue:
-      name: Hosted VS2017 
+      name: Hosted VS2017
 
 - template: /build/ci/phase-template.yml
   parameters:
diff --git a/build/vsts-ci.yml b/build/vsts-ci.yml
index fc3184bfc9..c6b72d95a2 100644
--- a/build/vsts-ci.yml
+++ b/build/vsts-ci.yml
@@ -23,6 +23,7 @@ phases:
     - agent.os -equals linux
     container: LinuxContainer
   steps:
+  # Only build native assets to avoid conflicts.
   - script: ./build.sh -buildNative -$(BuildConfig)
     displayName: Build
 
@@ -47,6 +48,7 @@ phases:
     demands:
     - agent.os -equals Darwin
   steps:
+  # Only build native assets to avoid conflicts.
   - script: ./build.sh -buildNative -$(BuildConfig)
     displayName: Build
 
@@ -58,7 +60,7 @@ phases:
       artifactType: container
 
 ################################################################################
-- phase: Windows
+- phase: Windows_x86
 ################################################################################
   variables:
     BuildConfig: Release
@@ -86,11 +88,60 @@ phases:
     continueOnError: false
     condition: and(succeeded(), in(variables._SignType, 'real', 'test'))
 
+  # Only build native assets to avoid conflicts.
+  - script: ./build.cmd -buildNative -$(BuildConfig) -buildArch=x86
+    displayName: Build
+  
+  - task: MSBuild@1
+    displayName: Sign Windows_x86 Binaries
+    inputs:
+      solution: build/sign.proj
+      msbuildArguments: /p:SignType=$(_SignType)
+      msbuildVersion: 15.0
+    continueOnError: false
+
+  - task: PublishBuildArtifacts@1
+    displayName: Publish Windows_x86 package assets
+    inputs:
+      pathToPublish: $(Build.SourcesDirectory)/bin/obj/packages
+      artifactName: PackageAssets
+      artifactType: container
+
+################################################################################
+- phase: Windows_x64
+################################################################################
+  variables:
+    BuildConfig: Release
+    OfficialBuildId: $(BUILD.BUILDNUMBER)
+    DOTNET_CLI_TELEMETRY_OPTOUT: 1
+    DOTNET_SKIP_FIRST_TIME_EXPERIENCE: 1
+    DOTNET_MULTILEVEL_LOOKUP: 0
+    _SignType: real
+    _UseEsrpSigning: true
+    _TeamName: DotNetCore
+  queue:
+    name: DotNetCore-Build
+    demands: 
+      - agent.os -equals Windows_NT
+  steps:
+
+  - task: ms-vseng.MicroBuildTasks.30666190-6959-11e5-9f96-f56098202fef.MicroBuildSigningPlugin@1
+    displayName: Install MicroBuild Signing Plugin
+    inputs:
+      signType: '$(_SignType)'
+      zipSources: false
+      esrpSigning: '$(_UseEsrpSigning)'
+    env:
+      TeamName: $(_TeamName)
+    continueOnError: false
+    condition: and(succeeded(), in(variables._SignType, 'real', 'test'))
+
+  # Build both native and managed assets. 
   - script: ./build.cmd -$(BuildConfig)
     displayName: Build
   
   - task: MSBuild@1
-    displayName: Sign Windows Binaries
+    displayName: Sign Windows_x64 Binaries
     inputs:
       solution: build/sign.proj
       msbuildArguments: /p:SignType=$(_SignType)
@@ -98,7 +149,7 @@ phases:
     continueOnError: false
 
   - task: PublishBuildArtifacts@1
-    displayName: Publish Windows package assets
+    displayName: Publish Windows_x64 package assets
     inputs:
       pathToPublish: $(Build.SourcesDirectory)/bin/obj/packages
       artifactName: PackageAssets
@@ -110,7 +161,8 @@ phases:
   dependsOn:
   - Linux
   - MacOS
-  - Windows
+  - Windows_x86
+  - Windows_x64
   variables:
     BuildConfig: Release
     OfficialBuildId: $(BUILD.BUILDNUMBER)