Converting existing Windows Server 2012 versions

Any time after installing Windows Server 2012, you can run Setup to repair the installation (sometimes called “repair in place”) or, in certain cases, you can convert to a different edition.
  You can run Setup to perform a “repair in place” on any edition of Windows Server 2012; the result will be the same edition you started with.
  For Windows Server 2012 Standard, you can the system to Windows Server 2012 Datacenter as follows:
  From an elevated command prompt, determine the current edition name with the command DISM /online /Get-CurrentEdition.
  
  Make note of the edition ID, an abbreviated form of the edition name. Then run DISM /online /Set-Edition: /ProductKey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX /AcceptEula, providing the edition ID and a retail product key.
  
  And press Enter :
  
  Note : About KMS Client setup key , you can find it from : http://technet.microsoft.com/en-us/library/jj612867.aspx
  Press Y and the server will restart twice. When you logon again , the version is converted to Datacenter :
  
    

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