IMHO, Exchange is Microsoft's killer app for a number of reasons. I am about to go do an Exchange 2003 installation for a client because the president of the company likes the fact that he can sync his mail on his laptop while he is on the road, because he can schedule meetings through Outlook, he can check his mail through a web based application (OWA) and his staff can sync their schedules with a variety of handhelds. I can counter most of his arguments piecemeal, but I really can't point to a single F/OSS solution, or even a suite of F/OSS solutions which can beat Exchange's features. So here is my question - has anyone had any success in replacing many or all of Exchange's features with any F/OSS solutions? It would be really cool if there were a F/OSS plugin that allowed Outlook 2000 to use a F/OSS backend like IMAP and LDAP or something like that. I have seen some commercial products like Toltec Connector and Bynari, but I am really interested in F/OSS. Thanks, Thomas Cameron, RHCE, CNE, MCSE, MCT