Using the Active Directory Installation Wizard
Unlike Microsoft Windows NT Server version 4 and earlier, Windows Server 2003 doesn’t designate a system as a domain controller during the operating system installation. Every Windows Server 2003 server installs as a stand-alone system or a member of a domain. After the installation is complete, you can promote the server to domain controller status using the Windows Server 2003 Active Directory Installation Wizard. This tool provides a great deal of additional flexibility to Active Directory administrators because servers can be promoted or demoted at any time, while Windows NT 4 servers are irrevocably designated as domain controllers during the installation process.
Also gone is the distinction ...
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