Unless otherwise indicated, the following tasks assume you already have the Active Directory Domains and Trusts console open. You must be a member of the Domain Admins group to perform these tasks.
Remember that this process is irreversible.
Right-click on a domain → Raise Domain Functional Level
You can also raise the domain functional level by right-clicking on the domain in Active Directory Users and Computers. To change the forest functional level, see Forest later in this chapter.
See Domain Controller later in this chapter.
You can either join a Windows 2003/2000/XP computer to a domain when installing the operating system or afterwards. If afterwards, do this:
Control Panel → System → Computer Name → Change → select Domain → type DNS name of domain → OK → specify credentials of a Domain Admin account → reboot
This creates a computer account in the domain. You can also create the computer account ahead of time using Active Directory Users and Computers.
Right-click on a domain → Manage
This opens the Active Directory Users and Computers console with the focus on the selected domain.