Here's the scoop:
I am adding this domain via a new server as a child to a parent domain - W2k domain - tree is child / parent domain is forest. In the parent domain I have an Exchange 2000 server that houses all my companies email (including other child domain in the forest).
The parent/child setup works fine. The problem - I cannot use Active directory migration tool to move the users from the parent to child (forest to tree) because I cannot put my 2000 server in native mode. This is due to having to run an NT server as a member server on the domain that controls a critical piece of equipment that we cannot move at this time.
so - I can recreate all my users on the new domain and log in with that option. that's fine - the problem is the email. Everytime I create an email account (whether from the AD wizard or on the exchange server) it tells me I cannot log onto to the default exchange files when I try to setup the user account in outlook or that the username cannot be resolved.