[Dovecot] IMAP: Get rid of non-existent folders below INBOX

Hi,

I am using Debian Sarge w/ dovecot-imapd package 0.99.14-1. Squirrelmail created three folders below INBOX, Drafts/Sent/Trash, that I already had elsewhere. Thus, I deleted them (through SqM).

However, both Thunderbird and Squirrelmail still show these folders anyway. When I select them, I keep getting "Mailbox does not exist" errors. I already tried to move all .imap.index* files in .INBOX/ out of the way -- dovecot created new ones but the folders still appear.

I am stuck. How can I prevent dovecot from advertising those non-existent folders? Is this an index-structure problem?

I'd appreciate any suggestions.

Thanks,

-- André