[Dovecot] ACL in public folders

[Keith Edmunds]

# dovecot --version
1.2.1

I'm trying to configure ACLs for public folders. I have:

--------------------------------------------------------------------------------
namespace public {
   separator = /
   prefix = shared2/
   location = maildir:/home/pubfolders2:INDEX=~/Maildir/public2
   subscriptions = no
   list = children
}
protocol imap {
  mail_plugins = acl
}
plugin {
  acl = vfile
}
--------------------------------------------------------------------------------

I have /home/pubfolders2/dovecot-acl containing:

user=xyz lrwstiekxa

I've also hardlinked the file to /home/pubfolders2/.info (one of the
public folders: that dir contains cur,tmp,new).

Since enabling ACLs in dovecot.conf, none of the users see the 'shared2'
namespace.

I've clearly misunderstood something. I'm expecting user xyz to be able to
see the public folder.

Grateful for any pointers.

Thanks,
Keith