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PidTagOriginalAuthorEntryId Canonical Property
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Contains the entry identifier 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 PR_SENDER_ENTRYID (PidTagSenderEntryId). It is never changed when the message is forwarded or replied to.
The original author property allows for preservation of information from outside the local messaging domain. When a message arrives from another messaging domain, such as from the Internet, this property provides a way to ensure that original information is not lost.