Just wondering if it's possible to run 2 versions of Mac OS X on one computer. I'm thinking if I can run Windows, then why not a previous Mac OS X version as well. My Macbook Pro runs Snow Leopard and I would also like to run Tiger, because it would help me troubleshoot a relatives iMac that has Tiger on it. They are long distance to me, so we communicate via voice online. Since I don't have Tiger on my machine, it's hard for me to know what they are talking about. So having Tiger on my machine would greatly help me understand their issues. Although now that I think it over, it would probably be easier to spend the $30 for the Snow Leopard upgrade disk for them.