We are getting ready to depoly Exchange Server 2003 very soon, but we have our existing mail server in place and want to keep it there for a little bit. It is running Imail on it, that is a pop3 server. We are going to set up Exchange and I am going to be the first person to move onto it, then the rest of the IT group and then company wide, just to make sure that exchange is working properly before we go company wide with it. THe question is, how do we have both running at the same time and be able to recieve mail for whoever it is to their corresponding server? This will only have to be in place for a couple of weeks maximum.