We tried, but could not find /doku.php?id=faq:everydayuse:how_do_i_create_a_public_mailbox_to_be_accessed_by_several_users&do=login§ok=99d1d5bef5a719c693bd97a196ae34f5
But hey, you don't have to leave empty handed!
Here are some things you can try instead: