Hello all. I've been reading websites about this OSX upgrade process, but I feel there are too many variables for an amateur like me to take into account, so I wanted to ask specific questions about my specific computer. I have a 2.16 Ghz Intel Core 2 Duo Macbook. My OS is Tiger 10.4.11. I also have Adobe CS4 and Microsoft Office 2004. And I have a brand new Snow Leopard 10.6.3 installation CD. I've been told that I can upgrade straight from Tiger to Snow Leopard. However, in case something goes wrong, I don't want to lose Microsoft Office or CS4. I no longer have the installation discs for these programs, so if I lost them, I'd lose them for good. I've been told that I can install Snow Leopard directly over Tiger, and my applications will just transfer. In conflict with that, I've also been told that I need to do a clean install if I'm going to skip normal Leopard, but will this make me lose CS4 and Office? Additionally, I've been told that no matter what I do, I must back everything up to an external hard drive; will this save my applications in the event that Snow Leopard crashes? And if so, how do I go about reinstalling CS4 and Office (and Tiger, for that matter, since I don't have Tiger installation discs)? If I have to do a clean install for Snow Leopard, can I move my backed-up Office and CS4 off the external drive and back onto my computer? I do not have many funds to throw around, so repurchasing CS4 and Office is something I can't do. So basically what I'm asking is, what's the safest way to make the upgrade to 10.6.3, under my circumstances? I'd appreciate any help!