We're capable of using Exchange as the mail server, we've just chosen to keep the prior carrier provided POP3 mailboxes as the front end. I know it sounds funny, but really....from a reliability standpoint, their clustered servers are always up, thus making sure that no important incoming messages will ever be rejected. I'd never really thought about doing it that way until I gained a few customers from other "outsource partners", and I'd found several deployments of this. Granted, usually they are using SBS, and the native POP3 downloader, but thought the idea would translate well for this deployment as well....that is until I realized that E2K doesn't come with a native connector. :-(