Adding outlook mail messages update functionality, which was not there

office365/outlook/mail/messages/message.py

@@ -19,6 +19,7 @@
 from office365.outlook.mail.recipient import Recipient
 from office365.runtime.client_result import ClientResult
 from office365.runtime.client_value_collection import ClientValueCollection
+from office365.runtime.http.http_method import HttpMethod
 from office365.runtime.paths.resource_path import ResourcePath
 from office365.runtime.queries.function import FunctionQuery
 from office365.runtime.queries.service_operation import ServiceOperationQuery
@@ -123,6 +124,22 @@ def _message_loaded():
                 os.path.basename(file_object.name), content.decode("utf-8")
             )
         return self
+
+    def update(self, payload):
+        """
+        Update the properties of a message. Only the properties that are set in the request body will be updated.
+
+        :param dict payload: A JSON object that contains the properties and values for the message.
+        """
+        def _construct_request(request):
+            request.method = HttpMethod.Patch
+
+
+
+        qry = ServiceOperationQuery(self, None, None, payload)
+        self.context.add_query(qry).before_execute(_construct_request)
+
+        return self
 
     def send(self):
         """