Bill Gates in his recent Interview with the Newsweek Magazine,
In many of the Vista reviews, people note that some Vista features are already in the Mac operating system
Bill Gates :
You can go through and look at who showed any of these things first, if you care about the facts. If you just want to say, “Steve Jobs invented the world, and then the rest of us came along”, thats fine. Maybe we shouldnt have showed so publicly the stuff we were doing, because we knew how long the new security base was going to take us to get done. Nowadays security guys break the Mac every single day [so your Mac] can be taken over totally. I dare anybody to do that once a month on a Windows machine. So, yes, because of the security stuff, it took us longer, and they had what we were doing, user-interface-wise.