We have acquired a small company running exchange 2003. I am also running exchange 2003. I have created usernames and email accounts on my end for the new users. I will export the new users old email and import them to my servers using exmerge. I would like to know how can I ensure that their email that was going to them at domain A gets forwarded to my domain B. Please provide me with any changes I have to make on their outside DNS, MX records etc.