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OS/2 was an operating system originally developed jointly by Microsoft and IBM. Between the release of Windows 3.0 and OS/2 1.3, Microsoft stopped all cooperation with IBM and IBM developed OS/2 on its own, starting with OS/2 2.0 and Microsoft uses OS/2 code to make Windows NT 3.1. OS/2 code was later used to Serenity Systems to work in eComStation, and by Arca Noae LLC to make ArcaOS.


OS/2 1.xx Versions

Name Version Codename Notes
OS/2 1.0 1.0 CP/DOS Released in 1987 without GUI
OS/2 1.1 1.1 Trimaran Released in 1988 first version with GUI
OS/2 1.2 1.2 Sloop Released in 1989
OS/2 1.3 1.3 Cutter Released in 1990

OS/2 2.xx Versions

Name Version Codename Notes
OS/2 2.0 2.0 Cruiser Released in 1992-04 without Microsoft
OS/2 2.00.1 2.00.1 Riker Released in 1992-10
OS/2 2.1 2.1 Borg (previously Yawl) Released in 1993-05
OS/2 for Windows 2.1 Ferengi Released in 1993-11 but is a program, not an OS
OS/2 2.11 2.11 None Released in 1994-02

OS/2 Warp Versions

Name Version Codename Notes
OS/2 Warp 3 3.0 Warp Released in 1994-06 with first Internet Connection
OS/2 Warp 4 4.0 Merlin Released in 1996
OS/2 Warp Server for e-Business 4.5 Aurora Released in 1999
OS/2 Warp 4.51 4.51 MCP/ACP Released in 2000
OS/2 Warp 4.52 4.52 MCP2/ACP2 Released in 2001

Planned versions that were never finishedEdit

Warp eraEdit

Version 5.0
Codename Gandalf or Merlin 2
Developed 2003, scheduled for release in 2005?
Development started but project was later scrapped