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The Worst-Selling Microsoft Software Product of All Time: OS/2 for the Mach 20 – Raymond Chen, writing for Microsoft DevBlogs: In the mid-1980s, Microsoft produced an expansion card for the IBM PC and PC XT, known as the Mach 10. In addition to occupying an expansion slot, it also replaced your CPU: You unplugged your old and busted 4.77 MHz 8088 CPU and plugged …