PidTagOwnerAppointmentId Property

Type: PtypInteger32 ([MS-OXCDATA] section 2.11.1)

The PidTagOwnerAppointmentId property ([MS-OXPROPS] section 2.856) specifies a quasi-unique value among all Calendar objects in a user's mailbox. The value of this property can assist a client or server in finding a Calendar object but is not guaranteed to be unique among all objects.<9> This property is not required on objects.