[Dovecot] Group inboxes

[Денис Квист]

Please help, i want made "Group Inboxes" like in MDaemon
"Group Inboxes:
Customer service organizations often use group inboxes to receive email
requests. Everyone in the customer service group has read and write access
to the collective incoming mailbox. In this manner, anyone in the group can
respond to each incoming email."

Is it possible?

Public folder is not work like i want
namespace private {
prefix =
separator = /
index = yes
}
namespace public {
prefix = office/
separator = /
location = maildir:/var/spool/mail/vhosts/testdomain.ru/Maildir/info
hidden = no
}

dovecot --version
1.0.rc15 (Debian Etch)