[Dovecot] Dovecot, Mail.app @ Leopard

[DinnoM]

Hi There,

I'm using dovecot-imapd 1.0.rc15-2etch1 under Debain Etch AMD64  
platform,
recently, once of our user reported that there have "Unknown  
Namespace" problem with the new mail.app under leopard.

So, is there a workaround at dovecot or I need to upgrade to a latest  
version of dovecot?

Regards,
Dino.