Have you tried toggling the Use Subscription Folders, and/or  
subscribing to said folders?


Quoting Jacob Beauregard <[log in to unmask]>:

> When I go to configure my UVM email in an previously unconfigured  
> Thunderbird client, it seems to be missing the primary folders that  
> I use, which I call "sent-mail" and "received-mail". I've also  
> gotten some odd messages when trying to read, move, or delete things  
> about those things not existing. Fortunately, this hasn't affected  
> my @work configuration for Thunderbird.
>
> I have tried with and without the "mail/" directory in the advanced  
> IMAP settings. Any ideas?

-- 
Helen Read
Senior Lecturer
Dept. of Mathematics & Statistics
University of Vermont