2.2.3.2.6 Subject

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To set the value of the PidTagSubjectPrefix property ([MS-OXOMSG] section 2.2.1.60) and the PidTagNormalizedSubject property ([MS-OXCMSG] section 2.2.1.10), clients MUST set the Subject header value, as specified in [RFC2822].

MIME readers SHOULD analyze the Subject header value into a prefix and a normalized subject value, as specified in section 2.2.3.2.6.1, and then set the values of the PidTagSubjectPrefix and PidTagNormalizedSubject properties, rather than simply setting the value of the PidTagSubject property ([MS-OXPROPS] section 2.1034). MIME readers can truncate the Subject value.

MIME readers use a Subject header value specified in a MIME message in preference to an attSubject attribute, as specified in [MS-OXTNEF] section 2.1.3.3.7, or to the value of the PidTagSubject property specified in a TNEF message. They SHOULD, however, use the values of the PidTagSubjectPrefix and PidTagNormalizedSubject properties instead of the PidTagSubject property from TNEF messages when they match the MIME message subject because of limitations in the subject normalization algorithm, as specified in section 2.2.3.2.6.1.