Unix Timeline

1981 – Unix System III

1983 – Unix System V

1988 – Unix System V/386 Release 3.2

1989 – Unix System V Release 4

1990 – UNIX System V Release 4 Multi-lingual

1991 – UNIX System V Release 4 Multi-Processor Version 1

1992 – UNIX System V Release 4.2 (SVR4.2)

1993 – UnixWare 1.1

1995 – UnixWare 2

1996 – UnixWare 2.1

1998 – UnixWare 7

1999 – UnixWare 7 Data Center Edition

2001 – Open UNIX 8