2.2.1.2 PidTagHasAttachments Property
Type: PtypBoolean ([MS-OXCDATA] section 2.11.1)
The PidTagHasAttachments property ([MS-OXPROPS] section 2.717) indicates whether the Message object contains at least one attachment. This property is read-only for the client.
The server computes this property from the mfHasAttach flag of the PidTagMessageFlags property ([MS-OXPROPS] section 2.792).