Display Outlook Appointment Extended Properties in outlook

Question

Is it possible to display outlook appointment extended properties in a custom outlook form or maybe an outlook addin? I have set the extended properties against the appointments using EWS. An example of how I have set them is below:

private static readonly ExtendedPropertyDefinition extendedPropertyEventID = new ExtendedPropertyDefinition(
                                                                                    new Guid("{00020329-0000-0000-C000-000000000046}"),
                                                                                    "EventID",
                                                                                    MapiPropertyType.String);


appointment.SetExtendedProperty(extendedPropertyEventID, "123456");

Answer 1

The way to do it if you are writing an outlook addin and If you are using the Outlook Object Model, all custom properties are available in the item's UserProperties collection (e.g. AppointmentItem.UserProperties).

Best Practices for Getting and Setting Properties http://msdn.microsoft.com/en-us/library/ff869735(v=office.15).aspx