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Turns out SCO bought Xenix in 1987, but Microsoft was just a couple of years removed from being the biggest Unix vendor around at this point.

I guess that's probably Apple now.

Or IBM?

z/OS is officially a Unix

There are an awful lot of iOS and macOS devices out there

macOS is a certified UNIX[0], but iOS isn’t.

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I still think Macs outnumber IBM mainframe and POWER machines by a couple orders of magnitude.

By unit count, no question.

By revenue? Genuinely uncertain.