OS/2 is a series of computer
operating systems, initially created by
Microsoft and
IBM, then later developed by 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.