OS/2

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OS/2 (an IBM-ism for "Operating System/2") is an operating system developed by IBM and Microsoft. It was marketed as a "professional" upgrade from DOS and 16-bit Windows, and was the precursor of Windows NT, leading directly to modern Windows. For a brief history of OS/2, read its Wikipedia entry.

Although IBM discontinued OS/2 at the end of 2006, a third-party version called eComStation has been available for several years from Serenity Systems, and is still undergoing active development.

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