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When you need to upgrade your active directory forest or you want to extend you’re schema, it can be usefull you find out what schema versie you are currently running.

You can determine the current version of the schema by checking value of the objectVersion attribute of the cn=schema,cn=configuration,dc=<root_domain> partition (where <root_domain> is the distinguished name of the root domain of your Active Directory forest). To find out the value of the objectVersion attribute you can use ADSIEdit.msc (include with Windows Support Tools).

Active Directory schema values:

When you are running Exchange server you can determine the version number by checking the value of the rangeUpper attribute of the CN=ms-Exch-Schema-Version-Pt,CN=Schema,CN=Configuration,DC=<your_domain> object.

Exchange Server schema values: