2.2.1.52 PidTagSenderSearchKey Property
Type: PtypBinary ([MS-OXCDATA] section 2.11.1)
The PidTagSenderSearchKey property ([MS-OXPROPS] section 2.1006) identifies an address book search key that contains a binary-comparable key computed by concatenating the value of the sending mailbox owner's PidTagAddressType property ([MS-OXOABK] section 2.2.3.13) and PidTagEmailAddress property ([MS-OXOABK] section 2.2.3.14) with a colon in between (for example, <TYPE>:<E_MAIL ADDRESS>), as specified by the SearchKey field of the RecipientRow structure ([MS-OXCDATA] section 2.8.3.2).