Xenix was also ported to a variety of other architectures as well. At my very first programming job, we had a Z8000 running a very early (V7-like) Xenix port. I

Xenix was also ported to a variety of other architectures as well. At my very first programming job, we had a Z8000 running a very early (V7-like) Xenix port. Its performance was not impressive; a 386 could run rings around it. Also, the segmented memory architecture limited processes to 64K instructions and 64K data. At a later job, we had several projects that we put together on the 386 version of Xenix; one of those is still in service today. It had moved to OpenServer relatively early on, and stayed that way until early this summer; my task was to get it running on a modern Linux. I was very (pleasantly) surprised to discover that the Unify database is still available, even for RHEL7 - and it was possible to directly take the database files from the old system and use them unmodified on the new one. I wonder what prompted Microsoft to give up on Xenix? AT&T wanting too much money, or perhaps Not-Invented-Here syndrome? Windows could have been an X desktop.