Sistema operativo propietario, perteneciente a The SCO Group. Está basado en Unix System V.
Originalmente Microsoft contrató a SCO para que escribiera el Xenix, surgió así SCO Xenix en 1983, luego apareció el Unix SCO Unix v3.2r4.0 y posteriores. En 1995 SCO presentó OpenServer 5.0 y continuó con posteriores versiones.
Versiones
Versión
|
Fecha
|
Codename
|
Ediciones
|
SCO UNIX System V/386
|
1989
|
?
|
|
Open Desktop 1.0
|
1990
|
?
|
|
Open Desktop 1.1
|
1991
|
?
|
Supplement for upgrade
|
SCO UNIX
|
1992
|
?
|
|
Open Desktop 2.0
|
1992
|
Phoenix
|
Desktop System, Server
|
Open Desktop/Server 3.0
|
1994
|
Tbird
|
Open Desktop, Open Desktop Lite, Open Server
|
OpenServer 5.0
|
1995
|
Everest
|
Desktop System, Host System, Enterprise System
|
OpenServer 5.0.2
|
1996
|
?
|
Desktop System, Host System, Enterprise System, Internet FastStart
|
OpenServer 5.0.4
|
1997
|
Comet
|
Desktop System, Host System, Enterprise System
|
OpenServer 5.0.5
|
1999
|
Davenport
|
Host System, Desktop System, Enterprise System
|
OpenServer 5.0.6
|
2000
|
Freedom
|
Host System, Desktop System, Enterprise System
|
OpenServer 5.0.7
|
14 de febrero de 2003
|
Harvey West
|
Host System, Desktop System, Enterprise System
|
OpenServer 6.0
|
14 de junio de 2005
|
Legend
|
Starter, Enterprise
|
OpenServer 10
|
15 de febrero de 2017
|
FreeBsd version
|
Enterprise, Server, Mainframe, Desktop system, DataCenter, Host
|