2.2.1.12 PidTagInternetMessageId Property

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

The PidTagInternetMessageId property ([MS-OXPROPS] section 2.749) corresponds to the Message-id field, as specified in [RFC2822]. This property SHOULD be present on all e-mail messages. More details about the conversion between this property and the Message-id field are specified in [MS-OXCMAIL] section 2.1.3.2.11.