126.96.36.199 Mail App Accesses Custom Properties
Looks up the identifier for the mail add-in in the manifest, as specified in [MS-OWEMXML].
Uses the procedures specified in [MS-OXCPRPT] section 188.8.131.52 and [MS-OXCPRPT] section 184.108.40.206 to retrieve the value of the named property, which contains a JSON object that contains the mail app's custom properties.
Returns the custom properties to the mail add-in.
If a mail add-in changes any of its custom properties, the client updates the JSON object, as specified in section 2.2.5, with the new information and writes it into the named property using the procedure specified in [MS-OXCPRPT] section 220.127.116.11.