2.2.2.8 PidTagOriginalSenderEntryId Property

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

The PidTagOriginalSenderEntryId property ([MS-OXPROPS] section 2.835) contains an address book EntryID that is set on delivery report messages to the value of the PidTagSenderEntryId property (section 2.2.1.50) from the original e-mail message.