protected function _getMboxFormatOb($mailbox, $list = false)
    {
        if ($this->_capability()->isEnabled('UTF8=ACCEPT')) {
            try {
                return $list
                    ? new Horde_Imap_Client_Data_Format_ListMailbox_Utf8($mailbox)
                    : new Horde_Imap_Client_Data_Format_Mailbox_Utf8($mailbox);
            } catch (Horde_Imap_Client_Data_Format_Exception $e) {}
        }

        return $list
            ? new Horde_Imap_Client_Data_Format_ListMailbox($mailbox)
            : new Horde_Imap_Client_Data_Format_Mailbox($mailbox);
    }