EWS Appointment ID. Unique?

Question

Is the Appointment.Id property or Appointment.Id.UniqueId really unique?

I have the simplest of methods, retrieving Appointments using ExchangeService.FindAppointments. My results are showing a few appointments with a different subject but the same Appointment.Id.UniqueId!

Am I missing something?

Answer 1

They are definitely unique. However, they are generated to be sequential, or close to sequential, so appointments created close together are likely to have very similar unique IDs. It's also worth noting that they are case sensitive. Are you sure that you're making a case-sensitive comparison? See the comment next to the ID property at http://msdn.microsoft.com/en-us/library/aa580234.aspx.