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How to demote an NT PDC to a member of a 2003 domain without reinstalling

We have two domains on same subnet. One is an NT domain with only one PDC and other is a 2003 domain with one DC. Two-way trust is established and working. We want to remove the NT domain and demote the NT PDC to a member server of the 2003 domain without reinstalling it. Is it possible? If so, how do we remove the NT domain?

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The only real thing that you can do is upgrade the NT PDC to being a Windows 2003 server. This will effectively upgrade the NT domain to a Windows 2003 Domain. Once it is a Windows 2003 domain, you can run DCPROMO and demote the Windows 2003 server to being must a stand alone server. I am assuming here that the PDC is the last server in the Windows NT domain. Once the server is a stand alone server, you can join the Windows 2003 domain. You haven't actually reinstalled the system -- only upgraded it.

This was first published in June 2005

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