Upgrading the Domain
Upgrading the domain is the second stage of the process of upgrading to Windows Server 2003. (The first stage is the upgrade of the NOS.) When upgrading a domain controller running either Windows NT Server 4 or Windows 2000 Server, after the NOS upgrade is complete and the computer restarts, the Active Directory Installation Wizard begins automatically. You should complete the Active Directory Installation Wizard according to your Active Directory design document. Once the Active Directory Installation Wizard is complete, the directory service is updated to Active Directory for Windows Server 2003.
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