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XNU is not a microkernel and a million posts by AFs will not change that. Sure some parts of XNU were based on MACH (http://en.wikipedia.org/wiki/Mach_kernel) long ago, but combined with all the FreeBSD stuff Apple ended up with something that is defintely not a microkernel. It is even more a monolith than it is a hybrid. The difference between KFreeBSD and XNU is not that great.