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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 ?
3Check the current edition
DISM /online /Get-CurrentEdition
, check if it's upgradeableDISM /online /Get-TargetEditions
, and if it isDISM /online /Set-Edition:<edition ID> /ProductKey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX /AcceptEula
. Two restarts latter you should be good to go. – Brian – 2014-08-07T11:57:44.520