The AirSync protocol was designed to work in a proprietary, non-standard environment. CommuniGate Pro AirSync module makes its best effort to convert AirSync data to the standard formats (such as iCalendar and vCard).
When an AirSync client accepts or declines an Event, it generates an E-mail message to be sent to the Event organizer. This message contains Microsoft proprietary data not suitable for any standard-based application. To provide a workaround for this problem, the CommuniGate Pro AirSync module generates a Reply itself, using the standard iCalendar format. As a result, the organizer may receive 2 Event Reply messages - one from the AirSync module, and one from the Windows Mobile client itself.
Note: when the Windows Mobile user chooses to accept or decline a request without sending a reply, only the Windows Mobile own request is affected. The AirSync module generates its reply independently, based only on the Event request "RSVP" attribute.
AirSync clients do not support sub-mailboxes of the Sent and Trash Mailboxes, and older clients do not support sub-mailboxes of the INBOX Mailbox either.
If an Account contains such sub-mailboxes, the Server does not inform an AirSync client about them.