I am strongly advocating someone to get off Microsoft Exchange and move to a Linux based mail server. I have used Sendmail but I find it a bit complex .
You've gotten recommendations for an SMTP server, which is good, but only part of the stuff you need to put in place. (I'll throw in here that I switched from sendmail to qmail and I can say that it fails to suck, though past that it's been completely ignorable. Which, I admit, I find to be a useful trait in server software) You'll also want a POP, IMAP, and possibly web-based mail access.
I'll admit to using the UW-IMAP server for pop and imap, and I can heartily *not* recommend using it in an environment with Outlook. While I, personally, have never had problems with it (I use Eudora for my mail client) other folks who use outlook have no end of problems.
Squirrelmail's a nice web-based mail access system. Yeah, it's PHP, but it works and, again, is generally nicely forgettable. (I would make sure to set it up to force-redirect to HTTPS connections rather than plain HTTP ones, to keep usernames and passwords from flying across the shub-internet in plain text)
If someone brings up calendaring, smack 'em, since I think you're likely screwed there. I don't know of any calendaring solution that integrates with Outlook. (But, then, I generally use iCal, so all I need is working WebDAV there, though PHP iCalendar (http://phpicalendar.sourceforge.net/nuke/) gives a nice web-based front end to it for read-only access)
--
Dan
--------------------------------------it's like this-------------------
Dan Sugalski even samurai
[EMAIL PROTECTED] have teddy bears and even
teddy bears get drunk
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