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Can windows 2000 and windows 2003 domain controllers coexist?

Last Modified: 2012-05-12
Dear Experts:
We need to upgrade our existing windows 2000 active directory structure to windows 2003 active directory.  There are two windows 2000 domain controllers in our small network.
We will install a windows 2003 member server into our existing win2k AD and promo it as domain controller.  At this point, which domain our users are connected when they log into our domain?  Are they connected to the old win2k Active Directory or this new win2003 active directory?
How do we know if they are connected to the new win2003 DC or our old win2k DC?
Can they still connect to our existing exchange 2003 server(member server)?
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