My environment is configured as following: We have a Windows 2000 domain (Native mode) with an Exchange 2000 site (mysite) for example and I have a separated environment which has a Windows 2003 domain with an Exchange 2003 site (newsite). I must have both environments turned on because I have users on both systems who share information between each other. I am looking for a tool which can be used to make a migration and keep them working out Cezar Renan