I am currently looking on the web for info on Upgrading from an NT 4.0 domain with Exchange 5.5 to Win2003 with Exchange 2003. Any one know of any good links. Currently our team is debating creating a seperate Win2003 domain with Exchange 2003. My main concern is getting the 5.5 mailboxes over to the new domain running Exchange 2003 smoothly. Thanks for any pointers.