[Dovecot] mailbox sharing with mdbox

Hello,

i want to know if it's possible to use mailbox sharing with mdbox. I have done a setup with maildir where it's working fine but with mdbox I'm only able to subscribe the shared folder but there are no messages in it. (maybe a problem with the namespace)

I'm running dovecot 2.2.6 [deb http://xi.rename-it.nl/debian/ stable-auto/dovecot-2.2.patched main ] on Debian Wheezy

Kind regards Stefan