am having serious issues with Exchange mail and am getting tired of it. I am required to offer calendaring, shared contacts, yadda, yadda, yadda.
Check out http://www.stalker.com and their CommuniGate Pro product. You can download it for free and test it. When you buy it, you can also buy spam-reduction and antivirus modules for it. Seems to be mature and stable, works with Outlook as a client via MAPI and has a web interface you can use in an emergency. Costs real money, but certainly less than MS Exchange.
Installation was terribly hard: "rpm -Uvh communigatepro.rpm". <smile>
-- Rodolfo J. Paiz rpaiz@xxxxxxxxxxxxxx http://www.simpaticus.com