We have a qmail server that has been in use for years and we are finally moving to exchange 2010 server. We have hundreds of users and migrating them all at one time is out of the question. Is there a way we can have both email servers active but forward specific user mailboxes from qmail to exchange? We want to wait to change the MX record as it will take sometime before we can get everyone migrated and they cannot miss any emails (very time critical). Any suggestions are welcome.