I need to erase my MBP so I'm doing all the back up I need but I don't know how to backup my emails from mail... Can you guys help me with this?
I'd suggest making a backup of your entire home folder, since there's plenty of other stuff in there you'll want to keep (like your keychain, probably some app preferences, and suchlike).
It's probably because you're trying to go BACK from a new version of Mail to an older one, if I had to guess. This is why most people don't downgrade.
Did you try copying the entire Mail folder from your old Leopard user Library into the Library folder inside your user folder in Tiger instead of using "Import" in Mail itself?
No... I did't copy the entire folder...
Can I upgrade my mail in Tiger to the one in Leopard?
Oh, well, then you didn't backup your Mail at all. You just backed up the mboxes, which are like databases. The raw messages themselves are stored in folders.
And no, the Mail in Leopard depends on system frameworks and libraries that are only present in Leopard.
Unfortunately, you've learned a hard lessonwhich is to say, "listen to killmoms," since I said five posts into the thread to backup your ENTIRE HOME FOLDER. It's always better to have more than you need than lose something. Sorry about the lost data, mate.
Jajajajaja... Yep... I've learn a lesson. I still have the backup from Time Machine I did yesterday. Can I use that to recover my mails?