After just a couple of hours, I’ve got a Novell GroupWise system running, with which I can experiment a bit and see what it is all about. Some of the terminology used by GroupWise is new to me, so I stumbled around a bit until I could get messages routed to and from the Internet, but it now works,

Received: from oes.mens.de ([192.168.1.90])
        by home.mens.de (Exim 4.43)
        with esmtp id 1HRos8-0002rA-9l
        for JPmens@gmail.com; Thu, 15 Mar 2007 13:15:56 +0100
Received: from poscht-MTA by oes.mens.de
        with Novell_GroupWise; Thu, 15 Mar 2007 13:46:48 +0100
Message-Id: <45F94E3B020000AE0000003F@oes.mens.de>
X-Mailer: Novell GroupWise Internet Agent 7.0.1

and the headers look good to me. ;-) The GroupWise client on Windows looks a tad better than it does on Linux and Mac, but the functionality appears to be identical. Web access is of course also possible as it is with Microsoft’s OWA and Lotus’ DWA (a.k.a. iNotes) including address books, calendar and documents. Nice.