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PidTagOriginalSearchKey Canonical Property
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Contains the original search key for an entry copied from an address book to a personal address book or other writeable address book.
This property is one of the properties that contain information about the original source of a copied entry.
For a nonread report, this property contains a copy of the search key of the original message recipient for which the report is generated. When the original recipient is part of a distribution list, the search key of the distribution list is preserved for the report.