How to tell what version of Active Directory you have

If you want to view the current version of your Active Directory you have, you can browse to the following registry key on your domain controller(s).

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\NTDS\Parameters and select the subkey Schema Version.

13 = Microsoft Windows 2000
30 = Original release version of Microsoft Windows Server 2003 and Microsoft Windows Server 2003 Service Pack 1 (SP1)
31 = Microsoft Windows Server 2003 R2
44 = Windows 2008

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