OS/2

==Microsoft OS/2 SDK (prerelease)==
===1987===
The original OS/2 Software Development Kit (SDK) was issued by Microsoft in the fall of 1987 for $3,000. This logo was present in prerelease advertising, documentation, and box art in the lead up to the official releases of OS/2 by Microsoft and IBM.
==OS/2 1.x==
===1987–1992===
OS/2 1.0 was the first version of OS/2 released in December 1987. A user interface was introduced in version version 1.1. OS/2's branding always utilized a square tilted at 37 degrees into a rhomboid shape. Versions from 1.0 to 1.3 published by IBM included a logo featuring neon lettering.
===1989–1990===
This alternate logo would be used on editions published by Microsoft until its breakup with IBM in 1990.
==OS/2 2.0/Warp 3.0==
===1992–1995===
Announced at Las Vegas on October 21, IBM released OS/2 version 2.0 on May 31, 1992. The first 32-bit version of the system, it introduced a new object-oriented user interface known as Workplace Shell. The rhombus now displays five differently colored circles with "OS/2" typed diagonally inside.
===OS/2 Warp 3.0===
====1994–1995====
Released in 1994, OS/2 3.0 is the first version to bear the "OS/2 Warp" moniker. It featured new performance benefits, including broader hardware support, multimedia capabilities, and Internet networking. Two separate editions were made for OS/2 Warp 3, referred as "Blue Spine" and "Red Spine".
The logo was otherwise kept the same with the addition of a new wordmark.
==OS/2 Warp Connect/Warp 4==
===1995–2006===
With the release of OS/2 Warp Connect in June 1995, a new logo was introduced comprising the wordmark in a wavy holding shape. Rhomboidal imagery would continue to appear on box arts.
OS/2 Warp 4 would follow later in 1996. New features in this release were a tighter integration with Java technology, speech recognition, WarpGuide, and Assistance Center.
The last version released was OS/2 Warp Server for e-Business 4.52 in December 17, 2001.
Extended support for the operating system ended on December 31, 2006. OS/2's architecture would be continually supported by third-party development under IBM's license to Serenity Systems as eComStation, and later in 2017 to Arca Noae, LLC as ArcaOS.
==References==
Category:Operating systems
Category:IBM
Category:Computer hardware
Category:Microsoft
Category:Defunct
Category:1980s
Category:1987