I have a Windows NT Server 4.0 Domain Controller VPC. I have built a new Windows 2003 Server VPC. I would like to join this Windows 2003 Server to the NT Server 4.0 Domain Controller.
How do I do it?
This article outlines the difficulties encountered when joining Windows XP to an NT4 based domain, I assume the article is relevant to Windows 2003 as well.
You should be able to change the computer membership to the NT4 domain.
If you're trying to make a the Windows Server 2003 VPC a domain controller, then I suggest reading up here about the required domain functionality level a bit down the page there is some information about entering into interim mode.