So, if you intend to use any of your R2 boxes as a domain controller, you must first upgrade the schema using adprep from the Windows 2003 R2, disc #2.
Also, disc 2 is the one that actually upgrades your Windows 2003 to R2. The first disc contains a slipstream version of Windows 2003 SP1. Disc 2 makes the box R2. So run the adprep from disc 2 and now you can introduce R2 boxes as domain controllers.
So what's the schema versions for different Windows boxes?
- 13=Microsoft Windows 2000
- 30=Original release version of Microsoft Windows Server 2003 and Microsoft Windows Server 2003 Service Pack 1 (SP1)
- 31=Microsoft Windows Server 2003 R2
"You can verify the operating system support level of the schema by looking at the value of the Schema Version registry subkey on a domain controller. You can find this subkey in the following location:
You can also verify the operating system support level of the schema by using the Adsiedit.exe utility or the Ldp.exe utility to view the objectVersion attribute in the properties of the cn=schema,cn=configuration,dc=