Microsoft introduced a feature in Windows Server 2012 which enables snapshots to be reverted on Active Directory Domain Controllers without corrupting the Active Directory. This feature called VM-Generation ID also allows cloning of Active Directory running on virtual machines.

VMware vSphere 5.1 does support this feature since its release but I have not read a lot of information on it. Only recently VMware wrote a blogposting titled Windows Server 2012 VM-Generation ID Support in vSphere about the support.

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