Did you know you can upgrade an installation of Windows Server 2012 R2 done with eval media such as MSDN media to a fully licensed version? Here's how to do this if you have a volume licensed MAK key:
Open an elevated command prompt.
Type slmgr.vbs /div and you should see "EVAL" indicating your current installation is for evaluation only.
Type dism /online /get-currentedition and note the edition ID.
Type dism /online /set-edition: /productkey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX using your previously determined edition ID and your MAK license key.
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Mitch Tulloch is an eleven-time recipient of the Microsoft Most Valuable Professional (MVP) award and a widely recognized expert on Windows Server and cloud computing technologies. Mitch is also Senior Editor of WServerNews. For more information about him see http://www.mtit.com.