2.2.1.4 PidTagReplyRequested Property
Type: PtypBoolean ([MS-OXCDATA] section 2.11.1)
The PidTagReplyRequested property ([MS-OXOMSG] section 2.2.1.45) indicates whether a reply is requested by the message's sender. This property SHOULD NOT be changed on a meeting-related object because this property has a specialized meaning for meeting-related objects, as specified in [MS-OXOCAL]. This property SHOULD NOT<4> exist on a Task object. For a Message object that is neither a meeting-related object nor a Task object, this property SHOULD be set as follows for flags:<5>
For a basic flag, color flag, time flag, or a recipient flag: 0x01 (TRUE)
For a complete flag: 0x00 (FALSE)
For a sender flag: the PidTagReplyRequested property is not present
The server does not set the PidTagReplyRequested property.