code: def remove_delegate(owner, delegate)
        action = "#{SOAP_ACTION_PREFIX}/RemoveDelegate"
        resp = invoke("#{NS_EWS_MESSAGES}:RemoveDelegate", action) do |root|
          build!(root) do
            remove_delegate!(owner, delegate)
          end
        end
        parse_soap_response(resp)
      end
docs: Removes one or more delegates from a user's mailbox.
   @see http://msdn.microsoft.com/en-us/library/bb856564.aspx
  
   @param [String] owner The user that is delegating permissions
   @param [String] delegate The user that is being given delegate permission