Almost every developer I have worked with considers NT and XNU to be hybrid at this point. Unfortunately, almost everything in the parent comment is incorrect.

> Unfortunately, almost everything in the parent comment is incorrect.

Avie Tevanian would disagree, but what does he know?

P.s. Nice job regurgitating Wikipedia in your other comment, without understanding it. I guess with only 30 karma, you've got to get your HN points somehow… Next time, read the Wikipedia entry on Mach so you'll learn that Mach didn't even become an actual microkernel until version 3.0. OS X's XNU kernel branched at 2.5. Oops.