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PidTagOriginalSubject Canonical Property
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Contains the subject of an original message for use in a report about the message.
PR_ORIGINAL_SUBJECT, PR_ORIGINAL_SUBJECT_A, PR_ORIGINAL_SUBJECT_W
These properties are originally set to the same value as the PR_SUBJECT (PidTagSubject) property.
The subject properties are typically small strings of fewer than 256 characters, and a message store provider is not obligated to support the Object Linking and Embedding (OLE) IStream interface on them. The client should always attempt access through the IMAPIProp interface first, and resort to IStream only if MAPI_E_NOT_ENOUGH_MEMORY is returned.