Below is a list of OS versions and related schema versions.
Find out the current schema version by inspecting the objectVersion property of CN=Schema,CN=Configuration,<Forest DN> For example, to find out the current schema version, use a tool like ADSIEDIT or dsquery, e.g.:
dsquery * CN=Schema,CN=Configuration,<Forest DN> -scope base –attr objectVersion
| AD version | objectVersion |
| Windows Server 2000 | 13 |
| Windows Server 2003 | 30 |
| Windows Server 2003 R2 | 31 |
| Windows Server 2008 | 44 |
| Windows Server 2008 R2 | 47 |
| Windows Server 2012 | 56 |
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