MAPI Named Properties
Specifies whether an appointment message is recurrent.
Property ID (Name):
This property is TRUE if the appointment is a recurring appointment, and is FALSE if it is not recurring. This property specifies whether or not the object represents a recurring series. A value of TRUE indicates that the object represents a recurring series. A value of FALSE, or the absence of this property, indicates that the object represents either a single instance or an exception (including an orphan instance). Note the difference between this property and the LID_IS_RECURRING (PidLidIsRecurring) property.