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My question is pretty easy: what if other operating systems had had more success in the world?

We had others such as OS/2, Amiga OS, BeOS, Acorn (in the UK), and Atari for example. Let's say one or more of those took off a bit more, and we have a three- or four-way race amongst OS's and Microsoft didn't have the 90's to themselves, and Apple doesn't capture all the hip-mindshare in the 2000s with the iPod.

How about Amiga, Apple, and MS? Or Atari, OS/2, MS, and Apple? Or all of them, with Acorn taking Apple's place in the UK, the Dominions, and perhaps somewhat in Europe, and Apple moreso in America, and the others more worldwide?
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