SmarterMail is the Microsoft Exchange alternative because it is the only other email server on the market with native support for MAPI, the protocol that powers Exchange and Outlook. That means anything you can do on Exchange you can do with SmarterMail: no plug-ins and no additional software required. SmarterMail offers all of this and more for a FRACTION of the cost of Exchange. And unlike Exchange, features like instant messaging and audio / video conferencing with screen sharing are included at no extra charge.