Operating systems that time forgot

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OS

Today's IT world is dominated by Windows, Linux, Mac OS X, Android and a handful of other operating systems - but what about in years gone by? We look back at five operating systems that enjoyed their own (often brief) limelight before fading away.

OS/2

Not quite gone but certainly far enough out of sight to be all but forgotten, OS/2 was the creation of Microsoft and IBM. First released in 1987, OS/2 had everything a user could want: a graphical interface, a task switcher and the High Performance File System.

Then, in 1990, along came Windows 3.0 and, despite generally being considered a poor relative, it killed off OS/2 within a couple of years. The rest is history.

rest here