[Dovecot] Public folders, individual SEEN flags

Hi list

I'm trying to set up shared public folders with individual SEEN flags. I've set up three test users, but as soon as one of them marks a mail in the public folder as seen or unseen, that change is propagated to all three users. If I watch the dovecot.index.log file in each user's directory for the public folder, I see all three change their last access time as soon as one user changes the SEEN status of a mail.

Any hints as to what I'm doing wrong gratefully received, thanks.

# dovecot --version 1.2.1

# dovecot -n # 1.2.1: /etc/dovecot/dovecot.conf # OS: Linux 2.6.26-2-686 i686 Debian 5.0.2 log_timestamp: %Y-%m-%d %H:%M:%S disable_plaintext_auth: no login_dir: /var/run/dovecot/login login_executable: /usr/lib/dovecot/imap-login mail_privileged_group: mail namespace: type: private separator: / inbox: yes list: yes subscriptions: yes namespace: type: public separator: / prefix: shared/ location: maildir:/home/publicfolders:INDEX=~/Maildir/public list: yes auth default: passdb: driver: pam userdb: driver: passwd

# ls -l /home/publicfolders/dovecot-shared -rw-rw-r-- 1 publicfolders publicfolders 0 2009-07-27 15:01 /home/publicfolders/dovecot-shared