My compnay is transitioning from both Exchange Server 2003 and Lotus Notes 7.0.2 to Exchange Server 2007. I am going to use a co-existence strategy and I will initially move 4 Lotus users and 2 exchange 2003 users to the new 2007 platform. I have 60 Exchange Server 2003 users that will need to continue to receive e-mail and 2 users that need to receive e-mail on the new Exchange Server 2007 machine. What do I need to do to the MX records for this to happen? Is it as simple as using a weighted MX record with a value of 20 so that when mail arrives for these two new 2007 users it hits the old mail server and realizes that they do not have a mailbox on this server and then roles to the next MX record where it finds the new server and delivers the mail?