After migrating to new mac, email folders are lost.
I used Migration Assistant to transfer files and data from my old MacBook Air to my new MacBook Air. Everything seems to have transferred just fine, except for my email folders. I have tried plugging in Time Machine to restore them from my backups on my old mac, but the new mac doesn't recognize backups on the old one, so I can't access it through Time Machine while in the mail program. So then I tried searching for my mail files, which (according to what I've read) should be in Library/Mail, but I have no Mail folder that I can find by that path (or, really, by any other). I believe both macs are running Mountain Lion.
MacBook Air (11-INCH, MID 2011), OS X Mountain Lion (10.8)