1981-06-xx   Xenix Standard Operating Environment - See document

1985-01-21   Microsoft and AT&T Joint Plans for Xenix and Unix System V - See document

1987-02-19   AT&T and Microsoft to Introduce Version of Unix System V - See document
1987-04-02   Microsoft Xenix System V/386 - See document

1988-08-22   Santa Cruz Operation Endorses Unix Trademark

1989-03-01   SCO Open Desktop
1989-06-30   SCO Unix System V/386 Release 3.2

1990-11-26   SCO MPX 1.1.0

1991-06-25   Intel Demos Multiprocessing SCO Open Desktop and SCO MPX

1992-01-01   SCO Unix System V/386 Release 3.2 Version 4.0
1992-01-24   SCO Unix Operating System Version 4
1992-05-20   SCO Open Desktop Release 2.0 for Intel Systems
1992-05-20   SCO Open Desktop Server System

1993-06-07   SCO Open Desktop Release 3.0

1995-05-09   SCO OpenServer Release 5

1996-06-17   SCO OpenServer Release 5.0.2

1997-05-06   SCO OpenServer Release 5.0.4

1998-08-17   SCO OpenServer 5.0.5