Upgrading the Domain
Upgrading the domain to AD DS is the second stage of the process of upgrading to Windows Server 2008. (The first stage is the upgrade of the NOS.) When upgrading a domain controller running either Windows 2000 Server or Windows Server 2003, after the NOS upgrade is complete and the computer restarts, the Active Directory Domain Services Installation Wizard begins. You should complete the fields in the Active Directory Domain Services Installation Wizard according to your AD DS design document. After the wizard is complete, the directory service is updated to AD DS for Windows Server 2008.
For more information on designing ...