2.2.4.1 PidNameInternetSubject
DAV property name: urn:schemas:mailheader:subject
Data type: PtypString ([MS-OXCDATA] section 2.11.1.6)
The PidNameInternetSubject property ([MS-OXPROPS] section 2.449) gets or sets the subject of the message. This property differs from the PidTagSubject property ([MS-OXPROPS] section 2.1033) only in that all characters encoded as specified in [RFC1522] are not decoded.