Domain change

Hi,
Have a network with windows 2000 server as DC.
We r installing a new windows 2000 server as DC with a new name. and want to shift all user profiles from old DC to new DC, without making any changes to user profiles & user mail configuration. We are using POP3 email a/c with microsoft outlook & outlook express as email client.
I would like to know what all are the possible ways of “shifting user profiles & mail configuration from old windows2k server to new windows2k server DC which have a new DC name.
without making any changes to user profiles & user mail configuration.”
Regards,
Joe