I once used Parallels v3 for a few months over a year ago. I have since used Boot Camp to run Vista on my Macs. Anyways, I was trying to read about both Parallels 4 and Fusion 2 to decide which route to go... as I never really want to use Boot Camp as the one program I use in Windows is a VB custom application that is simple... So, I don't really want to use Boot Camp anymore. I would rather go back to virtualization since it's only about eight hours over two days of every month that I use Windows. So, I read a few other posts about Parallels or Fusion, and a few people have mentioned Virtual Box. What are the advantages of Virtual Box other than it being free? I don't want to skimp when I can get either for less than $40 versus Virtual Box for free... So, it's not really a money issue. I just want my MacBook to remain stable. I only use one computer for everything now, so I am completely dependent on the computer and I cannot accept "down time." Knowing this information, is there any reason NOT to use Virtual Box? I seem to read good things about it, and I only will use it maybe eight hours per month. Are the two main virtual products more stable than Virtual Box? In most Posts I read, people seemed to recommend Fusion due to speed. Is Virtual Box slower? Is Parallels 4 slower? Thanks for any/all input and advice you can give me. Happy New Year!