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2.2.3.2.6.1 Normalizing the Subject

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If no values are available for the PidTagNormalizedSubject property ([MS-OXCMSG] section 2.2.1.10) and the PidTagSubjectPrefix property ([MS-OXOMSG] section 2.2.1.60) in the MIME message, servers SHOULD parse the Subject header value and set those values as follows. If the Subject header value consists of one, two, or three characters (exclusive of colon (U+003A), blank (U+0020), or digits (U+0030 through U+0039)), followed by a colon (U+003A) and any number of blanks (U+0020), the server SHOULD set the value of the PidTagSubjectPrefix property to the aforementioned one, two, or three characters appended with a colon and a space (": "), and SHOULD set the value of the PidTagNormalizedSubject property to the remainder of the Subject header value beginning immediately after the aforementioned blanks.