2.2.1.31 PidTagCreatorEntryId Property
Type: PtypBinary ([MS-OXCDATA] section 2.11.1)
The PidTagCreatorEntryId property ([MS-OXPROPS] section 2.656) specifies the original author of the message according to their address book EntryID. The format of an address book EntryID data type is specified in [MS-OXCDATA] section 2.2.5.2.