I have a 3 1/2 year old iBook (12", 800 MHz, 640 MB Ram, 40 GB hard drive) that I am thinking of upgrading from Panther to Tiger. I've had a copy of 10.4 for quite a while (free from my college), but there was never really a need to upgrade. My computer works fine and I had I the programs I needed. But I'm thinking of getting an iPhone and that would require 10.4. I'd appriciate input on a couple of questions I have. (1) From what I've read, it seems the best bet is to do a clean install. Does that seem right? (2) Before I do the upgrade, I'm planning on making a bootable copy of my hard drive on an external drive. Should I take any other precautions? (3) Is it possible to save all of the messages I have in Mail so that I can still access them after the install? Thanks!