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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.

Microsoft later used OS/2 code to develop Windows NT 3.1. OS/2 code was later used by Serenity Systems to develop eComStation, which in turn was used by Arca Noae LLC to develop ArcaOS.

Timeline[edit | edit source]

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 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 1994-10
OS/2 Warp 4 4.0 Merlin Released in 1996-09
OS/2 Warp Server for e-Business 4.5 Aurora Released in 1999-04
OS/2 Warp 4.51 4.51 MCP/ACP Released in 2000-11
OS/2 Warp 4.52 4.52 MCP2/ACP2 Released in 2001-12

Planned versions that were never finished[edit | edit source]

Warp era[edit | edit source]

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