Winnt32. Use Winnt32 to check the upgrade compatibility of the server.
Adprep. Use Adprep on the schema operations master to prepare the forest. Running Adprep on the schema master updates the schema, which in turn replicates to all of the other domain controllers in the forest.
Note that until you have used Adprep to prepare the forest and the domains within the forest, you cannot upgrade domain controllers running Windows 2000 to Windows Server 2003, or add domain controllers running Windows Server 2003 to Windows 2000 domains.
With the new Active Directory features in Standard, Enterprise, and Datacenter editions, more efficient administration of Active Directory is available to you.
Some new features are available on any domain controller running a newer version of Windows Server, while others are only available when all domain controllers of a domain or forest are running newer versions of Windows Server.
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