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PidTagListHelp Canonical Property
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Contains the value of a Multipurpose Internet Mail Extensions (MIME) message's List-Help header field.
PR_LIST_HELP, PR_LIST_HELP_A, PR_LIST_HELP_W
To generate a List-Help header field, clients must set the value of PR_LIST_HELP or an associated property to the desired value. MIME writers must copy this value to the List-Help header field.
To set the value of these list server-related properties, MIME clients must write the header fields as specified in the following table:
Preferred header field name
Alternate header field name