IEmailThreadMetadataInclusiveReason Property

If IsInclusive is true, this field indicates why the email is inclusive. If the email message contains message content that is not copied in any of its subsequent replies or forwards, "Message" is displayed. If the email message has attachments that are not included in any of its subsequent replies or forwards, "Attachment" is displayed. If the email message has both new message content and new attachments not included in any of its subsequent replies or forwards, "Message, Attachment" is displayed.

If IsInclusive false, this value is blank.

string InclusiveReason { get; }