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Microsoft has released the first build of the Windows Server vNext Long-Term Servicing Channel (LTSC) release that contains both the Desktop Experience as well as Server Core in all 18 server languages



What’s New in Windows Server vNext LTSC Build 17623
For every preview release, we will provide a focus area that we would like you to take a look at and provide us with feedback on. We encourage you to try out any functionality in the release and we welcome your feedback.

Validation for every preview: There are two major areas that we would like you to try out in each preview release and report back any issues:

In-place OS Upgrade (from Windows Server 2012 R2, Windows Server 2016)
Application compatibility – please let us know if any server roles or applications stops working or fails to function as it used to
  Windows Server vNext LTSC Build 17623 released