title: How can I identifiy a specific appointment item in outlook
body: <p>We're facing a problem where we need to identify a specific appointment in outlook, even if it is a recurring appointment. But since the <a href="http://msdn.microsoft.com/en-us/library/office/ff863645%28v=office.15%29.aspx" rel="nofollow">GlobalAppointmentID</a> is just unique for the whole recurring series, we don't know how. </p>
  
  <p>For what I know, there is just no specific unique ID for a single appointment when it is a recurring one. So we thought we gerenate our own ID by adding the the Start-Time in Ticks to the GlobalAppointmentID, but we need / want to save this new ID in the appointment object (because the StartTime might change). </p>
  
  <p>My question: Is there a way to identify a specific appointment and if not, how can I save a value in a specific appointment, which is ALWAYS accessible and up-to-date for every recipients? </p>
  
  <p>//Edit: To be a bit more specific: We have an outlook plugin that allows to upload files to our server, which must be mapped to the specific appointment (and to all recipients). For normal, single time meetings we just just the GlobalAppointmentID. If it is a recurring appointment it still needs to be mapped to one specific "meeting". Most of the time this meeting / appointment does not contain any exceptions in time or whatever. So I need to get this specific ID in C#.</p>