diff --git a/README.md b/README.md
index d0a664e..1b6cfdc 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,12 @@
 ![IIS Docker Image](https://avatars2.githubusercontent.com/u/6154722?v=3&s=200)
 # IIS Docker Image
 
+# Supported Windows Server, version 1903 amd64 tags
+
+ `docker pull mcr.microsoft.com/windows/servercore/iis:windowsservercore-1903`
+
+ [`windowsservercore-1903, latest` (*windowsserver/Dockerfile*)](https://github.com/Microsoft/iis-docker/blob/master/windowsservercore-1903/Dockerfile)
+
 # Supported Windows Server 2019 amd64 tags
 
  `docker pull mcr.microsoft.com/windows/servercore/iis:windowsservercore-ltsc2019`
@@ -13,20 +19,12 @@
 
  [`windowsservercore-1803, latest` (*windowsserver/Dockerfile*)](https://github.com/Microsoft/iis-docker/blob/master/windowsservercore-1803/Dockerfile)
 
-# Supported Windows Server, version 1709 amd64 tags
-
- `docker pull mcr.microsoft.com/windows/servercore/iis:windowsservercore-1709`
-
- [`windowsservercore-1709, latest` (*windowsserver/Dockerfile*)](https://github.com/Microsoft/iis-docker/blob/master/windowsservercore-1709/Dockerfile)
-
 # Supported Windows Server 2016 amd64 tags
 
  `docker pull mcr.microsoft.com/windows/servercore/iis:windowsservercore-ltsc2016`
 
  [`windowsservercore-ltsc2016, latest` (*windowsserver/Dockerfile*)](https://github.com/Microsoft/iis-docker/blob/master/windowsservercore-ltsc2016/Dockerfile)
 
- `docker pull mcr.microsoft.com/windows/servercore/iis:nanoserver-sac2016`
-
 ## What is IIS?
 Internet Information Services (IIS) for Windows® Server is a flexible, secure and manageable Web server for hosting anything on the Web.
 
diff --git a/nanoserver-sac2016/Dockerfile b/nanoserver-sac2016/Dockerfile
deleted file mode 100644
index beca645..0000000
--- a/nanoserver-sac2016/Dockerfile
+++ /dev/null
@@ -1,19 +0,0 @@
-# escape=`
-FROM microsoft/nanoserver:sac2016
-
-RUN powershell -NoProfile -Command `
-    New-Item -Type Directory C:\install; `
-    Invoke-WebRequest https://az880830.vo.msecnd.net/nanoserver-ga-2016/Microsoft-NanoServer-IIS-Package_base_10-0-14393-0.cab -OutFile C:\install\Microsoft-NanoServer-IIS-Package_base_10-0-14393-0.cab; `
-    Invoke-WebRequest https://az880830.vo.msecnd.net/nanoserver-ga-2016/Microsoft-NanoServer-IIS-Package_English_10-0-14393-0.cab -OutFile C:\install\Microsoft-NanoServer-IIS-Package_English_10-0-14393-0.cab; `
-    dism.exe /online /add-package /packagepath:c:\install\Microsoft-NanoServer-IIS-Package_base_10-0-14393-0.cab & `
-    dism.exe /online /add-package /packagepath:c:\install\Microsoft-NanoServer-IIS-Package_English_10-0-14393-0.cab & `
-    dism.exe /online /add-package /packagepath:c:\install\Microsoft-NanoServer-IIS-Package_base_10-0-14393-0.cab & ;`
-    powershell -NoProfile -Command `
-    Remove-Item -Recurse C:\install\ ; `
-    Invoke-WebRequest https://dotnetbinaries.blob.core.windows.net/servicemonitor/2.0.1.6/ServiceMonitor.exe -OutFile C:\ServiceMonitor.exe; `
-    Start-Service Was; `
-    While ((Get-ItemProperty HKLM:\SYSTEM\CurrentControlSet\Services\WAS\Parameters\ -Name NanoSetup -ErrorAction Ignore) -ne $null) {Start-Sleep 1}
-
-EXPOSE 80
-
-ENTRYPOINT ["C:\\ServiceMonitor.exe", "w3svc"]
diff --git a/windowsservercore-1803/Dockerfile b/windowsservercore-1803/Dockerfile
index 6be6407..019f272 100644
--- a/windowsservercore-1803/Dockerfile
+++ b/windowsservercore-1803/Dockerfile
@@ -1,5 +1,5 @@
 # escape=`
-FROM microsoft/windowsservercore:1803
+FROM mcr.microsoft.com/windows/servercore:1803
 
 RUN powershell -Command `
     Add-WindowsFeature Web-Server; `
diff --git a/windowsservercore-1709/Dockerfile b/windowsservercore-1903/Dockerfile
similarity index 86%
rename from windowsservercore-1709/Dockerfile
rename to windowsservercore-1903/Dockerfile
index b4fde7b..e905cb0 100644
--- a/windowsservercore-1709/Dockerfile
+++ b/windowsservercore-1903/Dockerfile
@@ -1,5 +1,5 @@
 # escape=`
-FROM microsoft/windowsservercore:1709
+FROM mcr.microsoft.com/windows/servercore:1903
 
 RUN powershell -Command `
     Add-WindowsFeature Web-Server; `
diff --git a/windowsservercore-insider/Dockerfile b/windowsservercore-insider/Dockerfile
index 52e9362..b31d6c8 100644
--- a/windowsservercore-insider/Dockerfile
+++ b/windowsservercore-insider/Dockerfile
@@ -1,5 +1,6 @@
 # escape=`
-FROM microsoft/windowsservercore-insider:latest
+FROM mcr.microsoft.com/windows/insider:10.0.18362.113
+
 
 RUN powershell -Command `
     Add-WindowsFeature Web-Server; `
diff --git a/windowsservercore-ltsc2016/Dockerfile b/windowsservercore-ltsc2016/Dockerfile
index ed99781..6e73573 100644
--- a/windowsservercore-ltsc2016/Dockerfile
+++ b/windowsservercore-ltsc2016/Dockerfile
@@ -1,5 +1,5 @@
 # escape=`
-FROM microsoft/windowsservercore:ltsc2016
+FROM mcr.microsoft.com/windows/servercore:ltsc2016
 
 RUN powershell -Command `
     Add-WindowsFeature Web-Server; `