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I had to find a way to upgrade a server from Windows Server 2012 R2 Standard to Windows Server 2012 R2 Datacenter Edition. A colleague did the installation of the Standard edition instead of the required Datacenter...

So the question was : how to convert a Windows Server Edition from Standard to Datacenter, without having to manipulate offline ?

Ob1lan
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    Check the current edition `DISM /online /Get-CurrentEdition`, check if it's upgradeable `DISM /online /Get-TargetEditions`, and if it is `DISM /online /Set-Edition: /ProductKey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX /AcceptEula`. Two restarts latter you should be good to go. – Brian Aug 07 '14 at 11:57

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After some researches, I found the solution to my answer. I had to use the DISM command, with this syntax :

dism /online /Set-Edition:ServerDatacenter /productKey:<valid datacenter PK> /AcceptEula

After a reboot, my server was finally a Datacenter Edition.

Hope this helps.

Ob1lan
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  • Have you (not) read the comment of Brian? – Leo Chapiro Aug 07 '14 at 12:06
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    In fact, I already knew the answer, I tried to share a knowledge, but misread the Self-Answer topic. So the post was locked, and before I could validate my own answer, it appears that Brian wrote a comment. Btw, thanks for the help. – Ob1lan Aug 07 '14 at 12:10