I have a 3 year old iMac that is running 10.6.8 (it has to for 3 programs that will not run 10.7 or newer). I have a second Mac that is new and running 10.9.2 and I have decided to make that my primary computer and the older Mac my secondary. With that said, what is the best way to move my mail over? I have searched and come up with several options. I need to be able to make sure I copy it 100% as it sits so I have all my preferences, rules, signatures, and more importantly, all the emails stored locally in mail folders. I assume there is a way to copy it over so I can verify first before I shut it down on the older computer? Thanks for any advice in advance!