I am currently working on a project where a company is seperating one of its entities out from all others. Their current structure is all in 1 AD forest and 1 Exchange Organisation. We need to build a whole new forest and Exchange Organisation for this entity. We dont have a problem with creating new user accounts in the new AD and moving users if needs be, what I am wondering is if there is an easy way to migrate the mailboxes and distribution lists etc to the new Exchange Organisation? FYI Both domains are Win2k Native and the current Exchange is 5.5 but the new will be 2K3.