title: Need to create VSTO UserProperties with MS Graph
body: <p>We have an add in that works with user properties set as Outlook.OlUserPropertyType.olInteger
  I have been asked to integrate that with MSGraph.</p>
  <p>According to <a href="https://stackoverflow.com/questions/52376288/how-do-i-read-the-userproperty-value-in-outlook-using-ms-graph">this</a> post if user properties are created in a VSTO add in this can be accessed through MS Graph but how can I go the other way? I need to use <a href="https://docs.microsoft.com/en-us/graph/api/resources/extended-properties-overview?view=graph-rest-beta" rel="nofollow noreferrer">Outlook extended properties</a> but I am not sure how</p>
  <p>So far I am not sure how to add extended properties and how to pick them up in a VSTO add in</p>