I am going to install Fusion so that I can run IE7 for ActiveX websites. I determined that Fusion is a better choice for me based on Macrumor forum searches. I did not see any discussion on preferences of XP or Vista. It appears that MS can't eliminate XP due to large institutional following. The MS website says they will be supporting the OS well into the future even though they are not 'officially' selling the OS. I also like that it only requires 1.5 GB of HD space. Vista requires more HD space, but I hate to buy 'old' software (XP). It seems like users have mixed reviews of XP and Vista running under Fusion. So either should work ok if installed properly. Any opinions on Vista or XP running under Fusion? How about any +/- of using an OEM version or a boxed version? Thanks.