To me, MS is practically a separate universe from everything else. That's not to say that there aren't any significant differences between the nixes, but they

To me, MS is practically a separate universe from everything else. That's not to say that there aren't any significant differences between the nixes, but they are at least similar in terms of the big picture. It would seem that learning to administer a Windows system would require a lot of unnecessary retraining for a nix admin. And I'm pretty sure that's doubly true of the opposite.