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The mach kernel is often described as 'anemic'. (Incidentally, a couple of friends who work on the kernel don't have good things to say about its codebase.)

Mach is not OS X's kernel, XNU (http://en.wikipedia.org/wiki/Xnu) is. It contains a modified version of Mach 3.0, but it's not the same kernel. But regardless, the kernel is not particularly important when discussing the operating system's unixness.

I don't think that was the question.

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