2.2.3.5 attSubject Attribute Handling by the TNEF Writer
When TNEF is being used to encode an attached message, the message subject information is carried in encapsulated message properties in the attMsgProps attribute, not the attSubject attribute.
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When TNEF is being used to encode an attached message, the message subject information is carried in encapsulated message properties in the attMsgProps attribute, not the attSubject attribute.