3.1.4.2 Converting an Appointment Object to a Meeting Object

To change an Appointment object into a Meeting object, the client sets the asfMeeting bit to 1 in the PidLidAppointmentStateFlags property (section 2.2.1.10). As long as a meeting request has not been sent for the Meeting object (according to the PidLidFInvited property (section 2.2.4.4)), the client can set the asfMeeting bit to 0 (zero), reverting the Meeting object back to an Appointment object. However, after a meeting request is sent out, the asfMeeting bit MUST remain set to 1 on the Meeting object. In other words, the Meeting object MUST NOT revert to an Appointment object, even if all attendees are later removed.