Missing Mail Folders?

Had a shock this morning - my .Mac / MobileMe e-mail folders had vanished from the Mail application. I wanted to retrieve and file an outgoing e-mail from last night and there was nothing. Quelling down the initial panic attack, and knowing that .Mac mail is IMAP, I right-clicked on the .Mac inbox and up popped a menu - which had the all-relieving command Synchronize .Mac kirschen. This command will rebuild your .Mac folder structure from the cloud - saved!