Can't use EWS UpdateItem operation from Outlook add-in
问题 I'm am trying to update a dictionary element in the IPM.Configuration.OWA.UserOptions message using an UpdateItem via an EWS (SOAP) request from an Outlook web add-in with ReadWriteMailbox permissions. However it is failing with the following error in the response: ErrorAccessDenied: Office extension is not allowed to update this type of item. The UpdateItem request I'm using is a fairly straightforward example of updating a message by it's ID and setting the value of an extended property: <