One does not join any upgrade software. When switching from Win to Mac has Parallels 5.0 for me a distinct advantage, as opposed to 4.0: The so-called "Crystal" mode. Here the window of the Windows emulation under Parallels are easily integrated into the surface of Mac. Done. This gives the whole a completely simple functionality and thus can clear 5 Sterne.Vorstellen you look like a "mixed system" - with me without consequences for the perfomance. I am annoyed that I'm not already switched, because with 4.0, I was not so happy. 5.0 is a major advance for regular Windows users to the Mac.