Source: http://www.operating-system.org/betriebssystem/_english/bs-unicos.htm

1984 - Unicos
1986 April - Unicos 1.0
1986 Dec. - Unicos 2.0
1987 Sept. - Unicos 3.0
1988 July - Unicos 4.0
1989 May - Unicos 5.0
1991 Feb. - Unicos 6.0
1992 Oct. - Unicos 7.0
1994 March - Unicos 8.0
1995 Sept. - Unicos 9.0
1996 March - Unicos 9.1
1997 Jan. - Unicos 9.2
1997 Nov. - Unicos 10.0
1998 May - Unicos 10.0.0.2
1998 Oct. - Unicos 10.0.0.3
1999 Feb. - Unicos 10.0.0.4
1999 May - Unicos 10.0.0.5
1999 June - Unicos 10.0.0.6
2000 Jan. - Unicos 10.0.0.7
2000 Nov. - Unicos 10.0.0.8
2001 June - Unicos 10.0.1.0
2002 Aug. - Unicos/mp 1.0, based on the IRIX 6.5 kernel
2002 Dec. - Unicos/mp 2.0
2003 March - Unicos/mp 2.1
2003 July - Unicos/mp 2.2
2003 Nov. - Unicos/mp 2.3
2004 March - Unicos/mp 2.4
2004 Nov. - Unicos/mp 2.5
2005 March - Unicos/mp 3.0