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Windows Server 2016 Build 14393970 Enus April 2017 2021 Now

If in 2021 you needed to patch a Server 2016 build earlier than 14393.970, you could not directly install a 2021 cumulative update. The April 2017 update introduced a new servicing stack version that became mandatory for later updates. Specifically:

Thus, administrators building fresh 2016 images in 2021 often used an en-US ISO with April 2017 already slipstreamed.

If you found yourself on 14393.970 in 2021 or later, you had two primary paths:

enus = English (United States) – the default system language for the ISO.

Windows Server 2016 was released to manufacturing (RTM) on September 26, 2016, with build 14393.0. The versioning follows the pattern:
14393 = core RTM branch, .970 = cumulative update revision.

Windows Server 2016, like other Windows versions, has a lifecycle that includes support periods. Microsoft provides support for its products in multiple phases, typically including mainstream support and extended support.

As this is a cumulative update from April 2021, the main feature set revolves around patching vulnerabilities present in the OS up to that point.

# From elevated PowerShell
wusa.exe "C:\updates\windows10.0-kb4015217-x64.msu" /quiet /norestart
# Check success
Get-HotFix -Id KB4015217

For offline servicing of a WIM or VHD:

dism /Mount-Image /ImageFile:C:\mount\install.wim /Index:1 /MountDir:C:\offline
dism /Image:C:\offline /Add-Package /PackagePath:C:\updates\kb4015217.msu
dism /Unmount-Image /MountDir:C:\offline /Commit