[Dovecot] How create shared Maildir ?

[mlus]

Hello,  I'm bigginer dovecot.
I use dovecot version 1.0.15 (rc)  on debian .

How create shared maildir ?

I try to ..................

# mkdir /home/share
# maildirmake.dovecot /home/share/Maildir
# chown root:mail /home/share
# chmod 660 /home/share


# vi /etc/dovecot/dovecot.conf
-------- add  this   ----------
namespace public {
  separator = /
  prefix = share.
  location = maildir:/home/share/Maildir
}


Thunderbird can see "share" , but can't subscribe.....

Anyone please teach me how create shared maildir ?

Thank you.