I've repeated the tests with LSUB "" *. I think there's a problem with setting the namespace prefix.

telnet imap.xx.yy 143
        1 LOGIN user password
        2 LSUB "" *            => shows INBOX
                                        Sent
                                        Trash
                                        folderAA
                                        shared/UserB/folderXX
        3 LSUB "" *            => shows shared/UserB/INBOX
                                        shared/UserB/folderXX
                                        Sent
                                        Trash
                                        folderAA
        4 LSUB "" *            => shows shared/UserB/INBOX
                                        shared/UserB/folderXX
                                        Sent
                                        Trash
                                        folderAA

This behavior is reproducable. Please note that the mailboxes of the shared namespace are listed first and the own inbox of the user disappears.

Holger

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