In that case, it would probably be best to ask this question on the MSDN forums.

We don't use the exchange connector because the appointments we show are from Outlook and our own software.

Also some of our customers do not use exchange but just plain Outlook.

When we read the appointments of the logged  in user in Outlook the recurring appointments are read (using IncludeRecurringAppointments) and we get back all the appointments including the recurring appointments for a given period.

However, the customer can choose to view the calendar of a coworker and then the same code does not return the instances of the recurring appointments (the start/end are filled with the start/end of the global recurring appointment and not of the instance).