Removing old domain controller
The new 2008 server was successfully added to the domain and all controller functions where successfully transferred. Now its time to remove the old domain controller. Do I first uncheck the old server catalog box and let the domain simmer for a day or two before demoting the 2000 domain controller?
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Like needleboy said it is critical the before you make any major changes you should run dcdiag.
Before demoting old domain controller be sure that:
* at least one global catalog server exist in your domain
* at least one DNS server exist in your domain
* run dcddiag on new domain controllers and check for errors
* run dcpromo on old domain controllers
or *run dcpromo /forceremoval
If you have problems demoting old domain controllers reffer to this MS links:
http://support.microsoft.com/kb/332199
http://support.microsoft.com/kb/216498