Unreleased preview of Microsoft's OS/2 2.0 is a glimpse down a road not taken
Briefly

Developed to improve on DOS, OS/2 featured multitasking and a GUI, but Microsoft's work on Windows for PC clones overshadowed it.
Neozeed shared a stable preview of Microsoft's OS/2 2.0, which was developed alongside Windows but never officially released.
Read at Ars Technica
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