Small Business 2011 Mailbox merge

I just built a SBS 2011 server. I am trying to move my SBS 2003 user mailboxes to the new SBS 2011 server. I have followed the Microsoft deployment guide with using the answer file and the other steps they suggested. None of them seem to work. The only thing I want to move are the mailboxes. Does anyone have any step by step easy instructions to get the mailboxes moved easily. Any help would be appreciated.