Domain controllers that run Windows Server 2008 or Windows Server 2008 R2 can be upgraded to Windows Server 2012. If you are upgrading from Standard Edition
or Enterprise Edition you can upgrade to Windows Server 2012 Standard Edition or Datacenter Edition. If you are upgrading from Datacenter Edition, you can only upgrade to Windows Server 2012 Datacenter Edition. For more information, see the Windows Server 2012 ReadMe file.
You cannot upgrade domain controllers that run Windows Server 2003. To replace them, install domain controllers that run Windows Server 2012 in the domain, and then remove the domain controllers that Windows Server 2003.
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