search for: theldapuseriwanttosharemybox

Hi.. can anyone give me a hind how to setup shared mailboxes. I've already created the shared and private namespace. But ive no idea how to share a mailbox. Thunderbird and most other Clients seem not to support the setacl command. so do i have to create a plaintext file with "user=theldapuseriwanttosharemybox rw" ? thx Hans