I pre-ordered Snow Leopard and have some questions as I have never upgraded an OS before. Since it is Apple I am assuming the process will be very straightforward so I am not concerned about that. What I want to know though is will upgrading change any of my preferences or settings or anything else. I recently spent a lot of time setting up Google Sync with my iCal and iPhone and gmail. I would hate to have to figure that all out again. Will it change anything else or can I just to the upgrade and then pick up right were I left off with my computing?