Here's what I have and need to do. I have 2 domains (seperate forests) with DNS and a trust setup between them. Domain A is running Windows 2003 Server with an Exchange 2007 email server. Domain B is running Windows 2008 Server with an Exchange 2010 email server. Right now everyone is using Domain A. We are in the process of migrating everyone to Domain B. Here's what we need to do. Setup an email connector between the domains. So that I can migrate users mailboxes over to Domain B. Have them create a new user account on Domain B when the migration takes place. But also have mail flow still work with their current email address from the new 2010 exchange server through the connector between the 2007exchange server. (sort of how an upgrade/migration in the same domain works) If anyone can help me with this process that would be great! Thanks for any help.. Cheers!