PidTagOriginalSenderSearchKey Canonical Property
Applies to: Outlook 2013 | Outlook 2016
Contains the search key for the sender 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 original sender of a message. At first submission of the message, the client application should set this property to the value of the PR_SENDER_SEARCH_KEY (PidTagSenderSearchKey) property. It is never changed when the message is forwarded or replied to.
Provides references to related Exchange Server protocol specifications.
Specifies the properties and operations that are permissible on email message objects.
Provides data type definitions.
Contains definitions of properties listed as alternate names.