Upgrading from Windows 2000
The easiest upgrade process for moving to Windows Server 2003 is upgrading from Windows 2000 Server, because it doesn't require planning the Domain Name System (DNS) and Active Directory namespace, nor does it normally involve restructuring domains or migration of security principals.
You must perform a couple of steps to prepare the Active Directory forest and domains for the new schema and changes and additions supplied by Windows Server 2003. Each Active Directory forest that you maintain must be updated first, prior to upgrading any of its domains. Likewise, each domain within a forest must be prepared prior to upgrading any of the domain controllers in the domain.
The Windows Setup program (Winnt32.exe) has a new ...