OS/2

OS/2

Developer	IBM Microsoft (1.0–1.3)
Written in	C, C++ and assembly language
Working state	Historical, now developed as ArcaOS
Source model	Closed source
Initial release	December 1987 (1987-12)
Latest release	4.52 / December 2001 (2001-12)
Marketing target	Professionals, servers
Available in	Chinese, English, French, German, Italian, Japanese, Korean, Spanish, Portuguese, Russian
Platforms	x86, PowerPC
Kernel type	Hybrid kernel
Influenced by	MS-DOS, IBM PC DOS
Default user interface	Workplace Shell Graphical user interface
License	Proprietary
Succeeded by	First by eComStation, then ArcaOS
Official website	OS/2 Warp (Archived)

OS/2 is an operating system that was originally made by a joint agreement between the Microsoft and IBM companies. The name stands for "Operating System/2". It was intended to replace MS-DOS and Microsoft Windows. OS/2 was maintained by IBM until 2006.

IBM discontinued its support for OS/2 on 31 December 2006. Since then, it has been updated, maintained and marketed under the name eComStation. In 2015 it was announced that a new OEM distribution of OS/2 would be released that was to be called ArcaOS.

References

OS/2 had true multi-tasking. As a demonstration, ten 1 million line files were each put on display to screen in ten separate windows. On Windows 3.1, only one at a time had display activity. On OS/2, all ten displays moved uninterrupted simultaneously. IBM LAN Manager also had better measurable performance, being based on an OS/2 server. This was in the early 1990's.