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Firstly a rant, not aimed at the OP but generally for all, this site is maintained by volunteers that help by keeping it tidy and hopefully providing useful answers. The site also relies on those posting questions to help out by accepting answers to questions as this indicates to others that may have the same question an answer was helpful. Unfortunately many of those posting questions fail to help out in this way and then go on to seek further help from the volunteers.

As noted in my answer to your previous question the MAPI dissector is generated from the MAPI IDL file using PIDL. To update the dissector, a newer IDL file will be required and that may also require changes\additions to the MAPI cnf file and that will then allow a new dissector to be generated.

Note the current IDL file came from the OpenChange project, an open source replacement for Exchange which doesn't appear to have been updated for some time.

Of course, feel free to modify the generated dissector by hand in your local build but that won't be acceptable for inclusion back into the main project, as a generated dissector from an authoritative source is much preferred.