PidTagOriginalAuthorSearchKey Canonical Property
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Contains the search key of the author of the first version of a message, that is, the message before being forwarded or replied to.
This property is one of the address properties for the author of a message. At first submission of the message, the client application should set this property to the value of the PR_SENDER_SEARCH_KEYPidTagSenderSearchKey property. It is never changed when the message is forwarded or replied to.
The original author properties allow for preservation of information from outside the local messaging domain. When a message arrives from another messaging domain, such as from the Internet, these properties provide a way to ensure that original information is not lost.