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Microsoft MS-DOS 5 Upgrade (1991)
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Hilarious Microsoft MS-DOS 5 Upgrade sales training video from 1991. "No Pc Should Be Without It!" "Freeing up 45k of memory at least!"

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(short for Microsoft Disk Operating System) was the dominant operating system for the PC compatible platform during the 1980s.
It was the key product in Microsoft's growth from a programming languages company to a diverse software development firm. It also provided the platform on which early versions of Windows ran.
PS: Freeing up 45k of memory was a big deal at the time, when the maximum RAM was 640k!
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