Before you can introduce a new version of Windows Server into your domain as a Domain Controller, you must prepare the schema by running ADPREP to prepare the forest as well as the domain for the integration of the new OS version. To avoid surprises and other possible issues during the process, it is a very good idea to validate the current version of the schema before and after the ADPREP process has been completed.

To find the current Active Directory Schema Version, you can use one of the following methods:

Note: You will need to change the values in the path from "dc=domain,dc=local" to the correct values for AD implementation.

ADSIEdit.msc

Navigate to: "CN=Schema,CN=Configuration,DC=domain,DC=local" and review the current "objectVersion" attribute by clicking on the Properties of "CN=Schema,CN=Configuration,DC=domain,DC=local".

LDP.exe

Connect and Bind to one of your DCs using the ldp.exe tool.  Click on view, then tree.  The BASE DN is "CN=Schema,CN=Configuration,DC=domain,DC=local".

DSQuery

Open a command prompt and use this command: dsquery * cn=schema,cn=configuration,dc=domain,dc=local -scope base -attr objectVersion

The following information provide a mapping between the "objectVersion" attribute value, to the Active Directory Schema version:

13 -> Windows 2000 Server 30 -> Windows Server 2003 31 -> Windows Server 2003 R2 44 -> Windows Server 2008 47 -> Windows Server 2008 R2 51 -> Windows Server 2012

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