OS/2

OS/2 is a series of computer operating systems, initially created by Microsoft and IBM under the leadership of IBM software designer Ed Iacobucci. As a result of a feud between the two companies over how to position OS/2 relative to Microsoft's new Windows 3.1 operating environment, the two companies severed the relationship in 1992 and OS/2 development fell to IBM exclusively. The name stands for "Operating System/2", because it was introduced as part of the same generation change release as IBM's "Personal System/2 (PS/2)" line of second-generation personal computers. The first version of OS/2 was released in December 1987 and newer versions were released until December 2001.
OS/2 was intended as a protected-mode successor of PC DOS. Notably, basic system calls were modeled after MS-DOS calls; their names even started with "Dos" and it was possible to create "Family Mode" applications – text mode applications that could work on both systems. Because of this heritage, OS/2 shares similarities with Unix, Xenix, and Windows NT.
IBM discontinued its support for OS/2 on 31 December 2006. Since then, OS/2 has been developed, supported and sold by two different third-party vendors under license from IBM - first by Serenity Systems as eComStation since 2001, and later by Arca Noae LLC as ArcaOS since 2017.
== Fanmade versions ==
MinderiaYT made OS Warp Pack in 2016-17 (present versions, with OS/3 Warp, OS/4 Warp and OS/5 Warp) in one of his Windows Mockup kits, later in 2020 he made future versions of OS/2 Warp.
OS/2 is not that popular for OS Mockup Community.
== Trivia ==
* Agent 47 OS uses the same startup as OS/2 Warp 4 and the same shutdown as OS/2 Warp 3.
Category:Real operating system