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Finding Active Directory Schema Version

In a mixed OS domain controller environment you'll want to make sure your predecessors properly updated the schema by running the following:

•adprep /forestprep
•adprep /domainprep
•adprep /gpprep
If the above were not run or did not run properly you will likely have a schema version mismatch.

Active Directory Schema versions release by Microsoft:
•Windows 2000 RTM  =  13
•Windows Server 2003 RTM  = 30
•Windows Server 2003 R2 RTM =  31
•Windows Server 2008 RTM  = 44
•Windows Server 2008 R2 RTM  =  47
•Windows Server 2012 RC = 56

In order to check the Schema Version please perform the following:
1.Open ADSIEdit
2.Connect to the Schema Naming Context
3.Open the properties of "CN=Schema,CN=Configuration,DC=domain,DC=local"
4.Scroll down to the attribute ObjectVersion and match to the integer value listed above.
If you are having issues with your domain controllers, especially replication, an incorrect schema version may be the culprit.