Removing a Domain Controller
Occasionally, you might want to demote a domain controller to a member server, such as getting new hardware for the DC or in a lab situation in which you want to remove the domain and start fresh. Unlike in NT, which requires a reinstall to change domain membership or demote the domain controller, in Windows 2000 becoming a domain controller is not a one-way trip.
Demotion Considerations
The primary issue to consider is that you can add domain controllers to and remove DCs from a domain to your heart's content, but if you remove the last domain controller in a domain, that domain ceases to exist. Granted, a safety mechanism does exist because you must specify that the DC is the last controller in a domain to remove ...
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