How to move a mailbox across a forest from Exchange 2003 to Exchange 2007
We purchased a company and they are using Exchange 2003. I need to move their mailboxes over to our 2 new Exchange 2007 servers. I found the "Move Mailbox" wizard but it looks like the wizard can only see storage groups within our forest. Is this correct? Do I need to use the power shell cmdlet Move-mailbox? If so does anyone have an example of the command to use? Would that command leave a copy of the mailbox on the source server?