Checking if the AD Domain is Server 2012 ready

 

Use the Dsquery.exe command. Open a command prompt on a domain controllers and run:

dsquery * cn=schema,cn=configuration,dc=colv,dc=in -scope base -attr objectVersion

The output from a 2008 domain is:
objectVersion
47

If you promote a Windows Server 2012 in the domain OR manually run ADPrep.

The output from the command looks like this:
objectVersion
56

Version 56 of the schema of your forest now includes domain controllers running Windows Server 2012.