While glancing through the boards I've noticed that many people have advised to do a "clean install" when upgrading to Panther instead of using the "upgrade" method. Suppposedly the system performs better this way. I suppose this wouldn't be too hard for someone who has an external hard drive (Saving all information to hard drive, and reinstalling everything afterwards), but even then, and even more so to those who don't have an external drive, how does this make any logical sense? I'm looking to "switch" over, but I like to keep my computers for years (I don't really mind if it's considered "Obsolete" after a couple months). Do I truly have to delete all my files, settings, old calender notes to use have a well performing OS upgrade?