I’ve been using Gmail for a while now, but I like to have an offline backup of all my stuff – you never know. I’ve been using Thunderbird for this purpose, but I recently got a MacBook and only now got around to the problem of transferring my offline mail to it.
Every time I’ve switched computers, backing up and moving data has been a chore. Considering that I was moving between operating systems, I was fearing the worst.
Turns out I had no reason to worry – I just fired up Tbird in OS X, let it create a profile with an IMAP account (I have both IMAP and POP3 accounts), quit Tbird, and copied my Mail and ImapMail folders from the XP Thunderbird mail directory (under Application Data/Thunderbird/Profiles) into the corresponding directory in OS X (user/Library/Thunderbird/Profiles). Then I started Thunderbird, all my mail was available – the IMAP mail in the IMAP folder and the rest under Local Folders.
I wish all import/export/transfer/backup/restore operations were this simple!