Yesterday at the WWDC Apple had a bit of fun with Microsoft just before showing off Mac OS 10.5 "Leopard," pointing out a few features in Windows Vista that look more than a little similar to current features in Mac OS X. But how do Leopard's and Vista's new features really compare? Lifehacker attempts to answer that question with this side-by-side comparison of the two. The article isn't exhaustive, but goes over a few key areas. Backup? "Leopard's looks prettier, but are they basically the same thing? Probably." Apple's "Spaces"? "They're just virtual desktops, which have been around on Linux since, well, forever." Search? "Available in Google Desktop search for Windows right now, FYI." Calendar and Mail? "Leopard wins." Overall, it's a surprisingly mixed bag from the usually Mac-happy (not that there's anything wrong with that) Lifehacker crew.