With the new Mac Pro - currently the fastest Mac available - running Vista through emulation is now possible with the latest version of Parallels Desktop for Mac. A trial version has been released with experimental support for Windows Vista, so you can run Vista in a window, on your Mac OS X desktop. If you use a virtual desktop and another monitor, you could run Vista on the other monitor and Mac OS X on your main screen.
It's worth noting that running Vista or Windows XP through Parallels Desktop for Mac isn't anything like the old Virtual PC which was so dog-slow it was unusable. With the use of the Intel chipset, Vista and Windows XP flies on the Mac OS X desktop - well, it's certainly fast enough to use most apps on a day to day basis. You can also run other operating systems through Parallels Desktop for Mac, such as a Linux distro or OpenBSD.
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