220.127.116.11 PidLidFExceptionalAttendees Property
A value of TRUE for the PidLidFExceptionalAttendees property ([MS-OXPROPS] section 2.130) indicates that it is a Recurring Calendar object with one or more exceptions and that at least one of the Exception Embedded Message objects has at least one RecipientRow structure, as specified in [MS-OXCDATA] section 2.8.3. A value of FALSE or the absence of this property indicates that either the Calendar object has no exceptions or none of the Exception Embedded Message objects has RecipientRow structures.
Note that an Appointment object cannot have attendees but can have an Attachment object that is an Exception object, and an Exception object can be turned into a meeting that has attendees. Therefore, this property can be used to indicate that an exception to an appointment has attendees, even though the appointment (series) does not.
This value SHOULD NOT be set for any Calendar object other than that of the organizer's.