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There are quite a few ways to tell. Here are a few I found.
The correct version of the ADPrep.exe tool for Windows Server 2003 R2 is 5.2.3790.2075.
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:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\NTDS\Parameters
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=<domain> partition. The value of the Schema Version registry subkey and the objectVersion attribute are in decimal.
Schema Version ObjectVersion values and corresponding operating system support level
- 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
- 44=Windows 2008
******OR*********
adfind -sc schver. It gets objectVersion code and translates into Win2003 version.
******OR*********
Win2003 http://technet.microsoft.com/en-us/library/cc783495.aspx
To verify that the Active Directory Preparation tool has completed all operations successfully
