I am getting a MacBook Air, upgrading from a 2005 12" G4 PowerBook - this little machine has served me well! I am mostly just going to start again rather than try and migrate across much stuff, my music is all backed up on external drives and all my files are on Dropbox so should be easy to move. My one concern though is Mail. I have a lot of accounts and many thousands of emails on my PowerBook and I can't lose them as I search through them several times a day for various reasons. Is it possible to move my Mail stuff across? And if so, how do I do it with the least hassle and stress? Ideally I will move all the accounts but I can add them all again if I have to, it would be great if it could all be copied though as I have a lot of signatures and stuff too. Any suggestions?