I use VBA to pull meeting objects from an Outlook calendar into a MS Access table.
Is there a way to detect that an existing meeting has changed? I could check if the attendees and subject are the same and only the date/time is different, but I'm hoping there is a more elegant way.
I was going to loop through meeting objects in the calendar and see if a record with the matching EntryID already exists in the table, but the EntryID changes when the meeting details change.
EntryID is changed for an appointment only if the current user is an attendee and a meeting update is received from the organizer - Outlook recreates the appointment, but its appointment id (Appointment.GlobalAppointmentID) does not change.
If the appointment cannot be opened by its entry id, you can search the folder for a matching appointment based on the appointment id. Keep in mind that looping through all items in a folder (which can contain thousands of items) can be very slow, but OOM does not allow to search on binary properties in Items.Find/FindNext and Items.Restrict. You can switch to Extended MAPI (C++ or Delphi only) or Redemption (any language, I am its author) - it's version of RDOFolder.Items.Find allows a query against a binary property, e.g. "GlobalAppointmentID = '040000008200E00074C5B7101A...' "