2.2.1.58 PidTagSentRepresentingSearchKey Property
Type: PtypBinary ([MS-OXCDATA] section 2.11.1)
The PidTagSentRepresentingSearchKey property ([MS-OXPROPS] section 2.1018) identifies an address book search key, as specified by the SearchKey field of the RecipientRow structure ([MS-OXCDATA] section 2.8.3.2), that contains a binary-comparable key that represents the end user who is represented by the sending mailbox owner. If a sending mailbox owner sends on his or her own behalf, this property is set to the value of the PidTagSenderSearchKey property (section 2.2.1.52).