Exchange Replacement

[dbunker at boston.com]

I haven't used it since the mid 90's, but the best groupware package I've
ever used that in my mind competed with Exchange was Firstclass
(http://www.firstclass.com/).

It didn't run on any *nix at the time, but it did support our mac clients,
and a quick perusal of their site shows that the latest version is being
ported to Sun and Linux.

It was a very slick package, and worked well for our installation of 3000+
clients.