Operating System/2

IBM OS/2 1.x

 * IBM Operating System/2 Standard Edition Version 1.0
 * IBM Operating System/2 Extended Edition Version 1.0
 * IBM Operating System/2 Standard Edition Version 1.1
 * IBM Operating System/2 Extended Edition Version 1.1
 * IBM Operating System/2 Standard Edition Version 1.2
 * IBM Operating System/2 Extended Edition Version 1.2
 * IBM Operating System/2 Standard Edition Version 1.3
 * IBM Operating System/2 Extended Edition Version 1.3


 * LAN
 * IBM OS/2 LAN Server Version 1.0
 * IBM OS/2 LAN Server Version 1.2 (Apr 1990)
 * IBM OS/2 LAN Server Version 1.3 (Feb 1991)
 * IBM OS/2 LAN Server Version 2.0 (May 1992)

IBM OS/2 2.x

 * IBM OS/2 Version 2.0
 * IBM OS/2 Version 2.1
 * IBM OS/2 for Symmetrical Multiprocessing Version 2.11 (1994)