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PidTagOriginalSentRepresentingSearchKey Canonical Property
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Contains the search key of the messaging user on whose behalf the original message was sent.
This property is one of the address properties for the original represented sender of a message. It is used in a conversation thread.
A client application sending a message on behalf of another client should set this property to the value of the PR_SENT_REPRESENTING_SEARCH_KEY (PidTagSentRepresentingSearchKey) property at the first submission of the message. Once set, it should never be changed.