diff --git a/Jenkinsfile b/Jenkinsfile
index 95b1a240ef..ff0960a0bc 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -12,8 +12,8 @@ pipeline {
         booleanParam(name: 'janky', defaultValue: true, description: 'x86 Build/Test')
         booleanParam(name: 'z', defaultValue: true, description: 'IBM Z (s390x) Build/Test')
         booleanParam(name: 'powerpc', defaultValue: true, description: 'PowerPC (ppc64le) Build/Test')
-        booleanParam(name: 'windowsRS1', defaultValue: false, description: 'Windows 2016 (RS1) Build/Test')
-        booleanParam(name: 'windowsRS5', defaultValue: false, description: 'Windows 2019 (RS5) Build/Test')
+        booleanParam(name: 'windowsRS1', defaultValue: true, description: 'Windows 2016 (RS1) Build/Test')
+        booleanParam(name: 'windowsRS5', defaultValue: true, description: 'Windows 2019 (RS5) Build/Test')
         booleanParam(name: 'skip_dco', defaultValue: false, description: 'Skip the DCO check')
     }
     environment {
@@ -668,10 +668,20 @@ pipeline {
                         beforeAgent true
                         expression { params.windowsRS1 }
                     }
+                    environment {
+                        DOCKER_BUILDKIT        = '0'
+                        SKIP_VALIDATION_TESTS  = '1'
+                        SOURCES_DRIVE          = 'd'
+                        SOURCES_SUBDIR         = 'gopath'
+                        TESTRUN_DRIVE          = 'd'
+                        TESTRUN_SUBDIR         = "CI-$BUILD_NUMBER"
+                        WINDOWS_BASE_IMAGE     = 'mcr.microsoft.com/windows/servercore'
+                        WINDOWS_BASE_IMAGE_TAG = 'ltsc2016'
+                    }
                     agent {
                         node {
-                            label 'windows-rs1'
-                            customWorkspace 'c:\\gopath\\src\\github.com\\docker\\docker'
+                            customWorkspace 'd:\\gopath\\src\\github.com\\docker\\docker'
+                            label 'windows-2016'
                         }
                     }
                     stages {
@@ -685,7 +695,9 @@ pipeline {
                             steps {
                                 powershell '''
                                 $ErrorActionPreference = 'Stop'
-                                .\\hack\\ci\\windows.ps1
+                                [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
+                                Invoke-WebRequest https://github.com/jhowardmsft/docker-ci-zap/blob/master/docker-ci-zap.exe?raw=true -OutFile C:/Windows/System32/docker-ci-zap.exe
+                                ./hack/ci/windows.ps1
                                 exit $LastExitCode
                                 '''
                             }
@@ -697,10 +709,20 @@ pipeline {
                         beforeAgent true
                         expression { params.windowsRS5 }
                     }
+                    environment {
+                        DOCKER_BUILDKIT        = '0'
+                        SKIP_VALIDATION_TESTS  = '1'
+                        SOURCES_DRIVE          = 'd'
+                        SOURCES_SUBDIR         = 'gopath'
+                        TESTRUN_DRIVE          = 'd'
+                        TESTRUN_SUBDIR         = "CI-$BUILD_NUMBER"
+                        WINDOWS_BASE_IMAGE     = 'mcr.microsoft.com/windows/servercore'
+                        WINDOWS_BASE_IMAGE_TAG = 'ltsc2019'
+                    }
                     agent {
                         node {
-                            label 'windows-rs5'
-                            customWorkspace 'c:\\gopath\\src\\github.com\\docker\\docker'
+                            customWorkspace 'd:\\gopath\\src\\github.com\\docker\\docker'
+                            label 'windows-2019'
                         }
                     }
                     stages {
@@ -714,7 +736,8 @@ pipeline {
                             steps {
                                 powershell '''
                                 $ErrorActionPreference = 'Stop'
-                                .\\hack\\ci\\windows.ps1
+                                Invoke-WebRequest https://github.com/jhowardmsft/docker-ci-zap/blob/master/docker-ci-zap.exe?raw=true -OutFile C:/Windows/System32/docker-ci-zap.exe
+                                ./hack/ci/windows.ps1
                                 exit $LastExitCode
                                 '''
                             }
diff --git a/hack/ci/windows.ps1 b/hack/ci/windows.ps1
index 8828f73d01..dc2cd5246e 100644
--- a/hack/ci/windows.ps1
+++ b/hack/ci/windows.ps1
@@ -78,6 +78,9 @@ if ($env:BUILD_TAG -match "-WoW") { $env:LCOW_MODE="" }
 #                             docker integration tests are also coded to use the same
 #                             environment variable, and if no set, defaults to microsoft/windowsservercore
 #
+#    WINDOWS_BASE_IMAGE_TAG   if defined, uses that as the tag name for the base image.
+#                             if no set, defaults to latest
+#
 #    LCOW_BASIC_MODE          if defined, does very basic LCOW verification. Ultimately we 
 #                             want to run the entire CI suite from docker, but that's a way off.
 #                            
@@ -139,7 +142,7 @@ Function Nuke-Everything {
             }
 
             $allImages  = $(docker images --format "{{.Repository}}#{{.ID}}")
-            $toRemove   = ($allImages | Select-String -NotMatch "windowsservercore","nanoserver","docker")
+            $toRemove   = ($allImages | Select-String -NotMatch "servercore","nanoserver","docker")
             $imageCount = ($toRemove | Measure-Object -line).Lines
 
             if ($imageCount -gt 0) {
@@ -261,6 +264,18 @@ Try {
     # Make sure docker-ci-zap is installed
     if ($null -eq (Get-Command "docker-ci-zap" -ErrorAction SilentlyContinue)) { Throw "ERROR: docker-ci-zap is not installed or not found on path" }
 
+    # Make sure Windows Defender is disabled
+    $defender = $false
+    Try {
+      $status = Get-MpComputerStatus
+      if ($status) {
+        if ($status.RealTimeProtectionEnabled) {
+          $defender = $true
+        }
+      }
+    } Catch {}
+    if ($defender) { Throw "ERROR: Windows Defender real time protection must be disabled for integration tests" }
+
     # Make sure SOURCES_DRIVE is set
     if ($null -eq $env:SOURCES_DRIVE) { Throw "ERROR: Environment variable SOURCES_DRIVE is not set" }
 
@@ -345,14 +360,16 @@ Try {
             Write-Host -ForegroundColor Green "INFO: docker load of"$ControlDaemonBaseImage" completed successfully"
         } else {
             # We need to docker pull it instead. It will come in directly as microsoft/imagename:latest
-            Write-Host -ForegroundColor Green $("INFO: Pulling microsoft/"+$ControlDaemonBaseImage+":latest from docker hub. This may take some time...")
+            Write-Host -ForegroundColor Green $("INFO: Pulling $($env:WINDOWS_BASE_IMAGE):$env:WINDOWS_BASE_IMAGE_TAG from docker hub. This may take some time...")
             $ErrorActionPreference = "SilentlyContinue"
-            docker pull $("microsoft/"+$ControlDaemonBaseImage)
+            docker pull "$($env:WINDOWS_BASE_IMAGE):$env:WINDOWS_BASE_IMAGE_TAG"
             $ErrorActionPreference = "Stop"
             if (-not $LastExitCode -eq 0) {
-                Throw $("ERROR: Failed to docker pull microsoft/"+$ControlDaemonBaseImage+":latest.")
+                Throw $("ERROR: Failed to docker pull $($env:WINDOWS_BASE_IMAGE):$env:WINDOWS_BASE_IMAGE_TAG.")
             }
-            Write-Host -ForegroundColor Green $("INFO: docker pull of microsoft/"+$ControlDaemonBaseImage+":latest completed successfully")
+            Write-Host -ForegroundColor Green $("INFO: docker pull of $($env:WINDOWS_BASE_IMAGE):$env:WINDOWS_BASE_IMAGE_TAG completed successfully")
+            Write-Host -ForegroundColor Green $("INFO: Tagging $($env:WINDOWS_BASE_IMAGE):$env:WINDOWS_BASE_IMAGE_TAG as microsoft/$ControlDaemonBaseImage")
+            docker tag "$($env:WINDOWS_BASE_IMAGE):$env:WINDOWS_BASE_IMAGE_TAG" microsoft/$ControlDaemonBaseImage
         }
     } else {
         Write-Host -ForegroundColor Green "INFO: Image"$("microsoft/"+$ControlDaemonBaseImage+":latest")"is already loaded in the control daemon"
@@ -663,17 +680,20 @@ Try {
         if ($null -eq $env:WINDOWS_BASE_IMAGE) {
             $env:WINDOWS_BASE_IMAGE="microsoft/windowsservercore"
         }
+        if ($null -eq $env:WINDOWS_BASE_IMAGE_TAG) {
+            $env:WINDOWS_BASE_IMAGE_TAG="latest"
+        }
 
         # Lowercase and make sure it has a microsoft/ prefix
         $env:WINDOWS_BASE_IMAGE = $env:WINDOWS_BASE_IMAGE.ToLower()
-        if ($($env:WINDOWS_BASE_IMAGE -Split "/")[0] -ne "microsoft") {
-            Throw "ERROR: WINDOWS_BASE_IMAGE should start microsoft/"
+        if (! $($env:WINDOWS_BASE_IMAGE -Split "/")[0] -match "microsoft") {
+            Throw "ERROR: WINDOWS_BASE_IMAGE should start microsoft/ or mcr.microsoft.com/"
         }
 
         Write-Host -ForegroundColor Green "INFO: Base image for tests is $env:WINDOWS_BASE_IMAGE"
 
         $ErrorActionPreference = "SilentlyContinue"
-        if ($((& "$env:TEMP\binary\docker-$COMMITHASH" "-H=$($DASHH_CUT)" images --format "{{.Repository}}:{{.Tag}}" | Select-String $($env:WINDOWS_BASE_IMAGE+":latest") | Measure-Object -Line).Lines) -eq 0) {
+        if ($((& "$env:TEMP\binary\docker-$COMMITHASH" "-H=$($DASHH_CUT)" images --format "{{.Repository}}:{{.Tag}}" | Select-String "$($env:WINDOWS_BASE_IMAGE):$env:WINDOWS_BASE_IMAGE_TAG" | Measure-Object -Line).Lines) -eq 0) {
             # Try the internal azure CI image version or Microsoft internal corpnet where the base image is already pre-prepared on the disk,
             # either through Invoke-DockerCI or, in the case of Azure CI servers, baked into the VHD at the same location.
             if (Test-Path $("c:\baseimages\"+$($env:WINDOWS_BASE_IMAGE -Split "/")[1]+".tar")) {
@@ -686,18 +706,20 @@ Try {
                 }
                 Write-Host -ForegroundColor Green "INFO: docker load of"$($env:WINDOWS_BASE_IMAGE -Split "/")[1]" into daemon under test completed successfully"
             } else {
-                # We need to docker pull it instead. It will come in directly as microsoft/imagename:latest
-                Write-Host -ForegroundColor Green $("INFO: Pulling "+$env:WINDOWS_BASE_IMAGE+":latest from docker hub into daemon under test. This may take some time...")
+                # We need to docker pull it instead. It will come in directly as microsoft/imagename:tagname
+                Write-Host -ForegroundColor Green $("INFO: Pulling "+$env:WINDOWS_BASE_IMAGE+":"+$env:WINDOWS_BASE_IMAGE_TAG+" from docker hub into daemon under test. This may take some time...")
                 $ErrorActionPreference = "SilentlyContinue"
-                & "$env:TEMP\binary\docker-$COMMITHASH" "-H=$($DASHH_CUT)" pull $($env:WINDOWS_BASE_IMAGE)
+                & "$env:TEMP\binary\docker-$COMMITHASH" "-H=$($DASHH_CUT)" pull "$($env:WINDOWS_BASE_IMAGE):$env:WINDOWS_BASE_IMAGE_TAG"
                 $ErrorActionPreference = "Stop"
                 if (-not $LastExitCode -eq 0) {
-                    Throw $("ERROR: Failed to docker pull "+$env:WINDOWS_BASE_IMAGE+":latest into daemon under test.")
+                    Throw $("ERROR: Failed to docker pull $($env:WINDOWS_BASE_IMAGE):$env:WINDOWS_BASE_IMAGE_TAG into daemon under test.")
                 }
-                Write-Host -ForegroundColor Green $("INFO: docker pull of "+$env:WINDOWS_BASE_IMAGE+":latest into daemon under test completed successfully")
+                Write-Host -ForegroundColor Green $("INFO: docker pull of $($env:WINDOWS_BASE_IMAGE):$env:WINDOWS_BASE_IMAGE_TAG into daemon under test completed successfully")
+                Write-Host -ForegroundColor Green $("INFO: Tagging $($env:WINDOWS_BASE_IMAGE):$env:WINDOWS_BASE_IMAGE_TAG as microsoft/$ControlDaemonBaseImage in daemon under test")
+                & "$env:TEMP\binary\docker-$COMMITHASH" "-H=$($DASHH_CUT)" tag "$($env:WINDOWS_BASE_IMAGE):$env:WINDOWS_BASE_IMAGE_TAG" microsoft/$ControlDaemonBaseImage
             }
         } else {
-            Write-Host -ForegroundColor Green "INFO: Image"$($env:WINDOWS_BASE_IMAGE+":latest")"is already loaded in the daemon under test"
+            Write-Host -ForegroundColor Green "INFO: Image $($env:WINDOWS_BASE_IMAGE):$env:WINDOWS_BASE_IMAGE_TAG is already loaded in the daemon under test"
         }
     
     
@@ -705,7 +727,7 @@ Try {
         $ErrorActionPreference = "SilentlyContinue"
         $dutimgVersion = $(&"$env:TEMP\binary\docker-$COMMITHASH" "-H=$($DASHH_CUT)" inspect  $($env:WINDOWS_BASE_IMAGE) --format "{{.OsVersion}}")
         $ErrorActionPreference = "Stop"
-        Write-Host -ForegroundColor Green $("INFO: Version of "+$env:WINDOWS_BASE_IMAGE+":latest is '"+$dutimgVersion+"'")
+        Write-Host -ForegroundColor Green $("INFO: Version of $($env:WINDOWS_BASE_IMAGE):$env:WINDOWS_BASE_IMAGE_TAG is '"+$dutimgVersion+"'")
     }
 
     # Run the validation tests unless SKIP_VALIDATION_TESTS is defined.
@@ -752,14 +774,7 @@ Try {
             #if ($bbCount -eq 0) {
                 Write-Host -ForegroundColor Green "INFO: Building busybox"
                 $ErrorActionPreference = "SilentlyContinue"
-    
-                # This is a temporary hack for nanoserver
-                if ($env:WINDOWS_BASE_IMAGE -ne "microsoft/windowsservercore") {
-                    Write-Host -ForegroundColor Red "HACK HACK HACK - Building 64-bit nanoserver busybox image"
-                    $(& "$env:TEMP\binary\docker-$COMMITHASH" "-H=$($DASHH_CUT)" build -t busybox https://raw.githubusercontent.com/jhowardmsft/busybox64/v1.1/Dockerfile | Out-Host)
-                } else {
-                    $(& "$env:TEMP\binary\docker-$COMMITHASH" "-H=$($DASHH_CUT)" build -t busybox https://raw.githubusercontent.com/jhowardmsft/busybox/v1.1/Dockerfile | Out-Host)
-                }
+                $(& "$env:TEMP\binary\docker-$COMMITHASH" "-H=$($DASHH_CUT)" build -t busybox https://raw.githubusercontent.com/jhowardmsft/busybox/v1.1/Dockerfile | Out-Host)
                 $ErrorActionPreference = "Stop"
                 if (-not($LastExitCode -eq 0)) {
                     Throw "ERROR: Failed to build busybox image"
diff --git a/integration-cli/docker_cli_run_test.go b/integration-cli/docker_cli_run_test.go
index fd4fa1833b..1a5204ff67 100644
--- a/integration-cli/docker_cli_run_test.go
+++ b/integration-cli/docker_cli_run_test.go
@@ -1706,7 +1706,7 @@ func (s *DockerSuite) TestRunCleanupCmdOnEntrypoint(c *check.C) {
 	out = strings.TrimSpace(out)
 	expected := "root"
 	if testEnv.OSType == "windows" {
-		if strings.Contains(testEnv.PlatformDefaults.BaseImage, "windowsservercore") {
+		if strings.Contains(testEnv.PlatformDefaults.BaseImage, "servercore") {
 			expected = `user manager\containeradministrator`
 		} else {
 			expected = `ContainerAdministrator` // nanoserver