Re: Its The Open Group Who Dunnit
"It is sad to note that Exchange was originally developed by The Open Group - the holders of the UNIX trademark."
Could you elaborate on that a little.
AIUI Microsoft started out developing their own Unix port, Xenix and initially used its email system internally. It's a long time since I used Xenix but I think that server would have been sendmail. They then developed Exchange as their own server and migrated away from Xenix. https://web.archive.org/web/20050507010335/http://www.microsoft.com/technet/archive/itsolutions/intranet/build/exchgdep.mspx
They migrated away from Xenix in more senses than one. Once they started developing their own Windows-based server they sold Xenix to its major distributor, the Santa Cruz Operation which became SCO and continued to develop it. Xenix and SCO were both good Unix implementations but started to run into competition from Linux. My experience of the SCO OpenServer and early Linux suggested to me that if SCO were to price Openserver competitively the difference in quality would have blown Linux out of the water.
It's an interesting thought as to what that would also have done to Microsoft Server as well. Certainly SCO, particularly with Informix or similar RDBMS based products was a the basis of some good small business systems in the '90s, SCO on PC hardware having largely displaced the likes of NCR Towers and the like.
SCO were eventually taken over by a business that thought it had a golden opportunity to sue IBM and maybe Linux users over IBM's contribution to Linux. It didn't go well. I don't remember the exact corporate history; ISTR Caldera, a Linux distributor, AttachMate and the remnants of Netware were all involved. Novell had acquired Unix IP but transferred the trademarks to X/Open, one of the forerunners of The Open Group https://en.wikipedia.org/wiki/UNIX#History
It appears to me that it is an extreme stretch of the imagination to allege that The Open Group had any responsibility for Excahange. Did any code from Sendmail even make its way into Exchange?