Answer: they’re three of the most obscure products developed by a certain West Coast technology company:

• Mach 10 was a processor board upgrade for the IBM PC
• Booster was a mouse, clock, and memory upgrade for the IBM PCjr
• Bob was a short-lived friendly front-end for Windows 3.1 and Windows 95

And that company was Microsoft (or, as in early ads, MicroSoft). With Microsoft founder Bill Gates riding off into the sunset this week after his final keynote address at CES, I figured it was time to rediscover some of Microsoft’s strangest products ever. Have other nominees? Let us know.