Xenix was Microsoft's release of a Version 7 UNIX clone back in the mid to late 80s. Other clones at that time were Coherent and Cromix.<p>Xenix was eventually sold to the Santa Cruz Operation who released it as SCO Xenix and then as SCO upgraded to their UNIX to System V UNIX it was renamed as SCO UNIX.<p>If the name SCO rings a bell, it was Caldera renamed as The SCO Group which sued IBM around 2000 over the ownership of UNIX and tried to kill off Linux. I believe that lawsuit, though basically dead in the water for over ten years, is still running. I think SCOG is currently hoping that IBM will collapse and they can then win by default.<p>Version 7 UNIX was strictly command-line, though early versions of X-Window ran on it. It wasn't till SysV and BSD UNIX that the X11R6 desktop GUIs took off in the late 80s, IIRC.