220.127.116.11 PidTagNormalizedSubject Property
The PidTagNormalizedSubject property ([MS-OXPROPS] section 2.812) contains the normalized subject of the message, as specified in [MS-OXCMAIL] section 18.104.22.168.6.1. This property is set by the client but can be an empty string if there is no subject. The sum of the lengths of the PidTagNormalizedSubject property and the PidTagSubjectPrefix property (section 22.214.171.124) MUST be less than 254 characters.
More details about obtaining the value of this property are specified in section 126.96.36.199.