IMAP shared mailboxes: issues with kmail?

Hi,

are there any known issues with symlinked-shared-mailboxes and kmail?

I use dovecot with virtual users (LDAP), so there are no 
unix-permissions related 
problems here: all mailboxes are owned by the local user vmail.

Each user maildir has some symlinks to shared mailboxes. This works 
fine if I use squirrelmail as a MUA.

kmail instead seems to have some problems: if I save a mail into the 
shared-folder, the other users are seeing this new mail almost 
immediately. But if I delete(!) a mail from the shared-folder, the 
list of the other kmails remains untouch. Refreshing does nothing. I 
have to close kmail and restart.

Is this related to some sort of wrong config of the shared mailboxes 
or is this a (known) dovecot <-> kmail problem?

-- 
Wilhelm