I send and recieve lots of email, and for the last 3 years I have been saving all my messages. But I just recently bought a 12" powerbook and moved over to OS X, and I'm now using mail.
I have my Mail preferences set to save all sent messages, and it was working fine for a while but one day I looked in my sent folder and they were all gone. I checked the preferences and it's still set to save all sent messages and never delete them. Every email I've sent since then never gets saved, and when I click on the arrow next to the emails I've replied to, it says the message can't be found. Please help!