The list of Active Directory Schema versions:
- Windows 2000 RTM with all Service packs = Schema version 13
- Windows Server 2003 RTM with all Service packs = Schema version 30
- Windows Server 2003 R2 RTM with all Service packs = Schema version 31
- Windows Server 2008 RTM with all Service packs = Schema version 44
- Windows Server 2008 R2 RTM with all Service packs = Schema version 47
Check the schema version in the Registry:
HKLM\SYSTEM\CurrentControlSet\Services\NTDS\Parameters\<Schema Version>
Check the schema version with dsquery:
dsquery * CN=Schema,CN=Configuration,DC=Root-Domäne -Scope Base -attr objectVersion