2.2.2.1 PidTagMessageClass Property

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Type: PtypString ([MS-OXCDATA] section 2.11.1)

The PidTagMessageClass property ([MS-OXCMSG] section 2.2.1.3) specifies the type of the Message object. For a message to be treated as a Document object by a client, the value of this property MUST be "IPM.document.<FileType>", where the "<FileType>" substring indicates the type of the attached file. The value of the substring that follows "IPM.document." is implementation-dependent.