I have created an application in C# with VS2005 that is supposed to get
appointments from a central database and insert them into the users
Outlook calendar. I use the Office 2003 PIA to accomplish this.

When I insert appointments in my testing environment everything works
just peachy. In the production environment however, which is quite a bit
slower, Outlook gives out after about 20-30 appointments with the error:
"Unknown error" and after that: "Can't open the item". This happens when
I try to delete some of the items in Outlook that are an exception to a
recurring appointment.

I suspect there is something that needs to be flushed or cleared after
inserting an appointment, but I can't seem to find a suitable solution.
The code I use(simplified -- only the outlook parts are shown) is shown
below. Appointment is a custom object that contains the properties of my
appointments.

My question: Is this a good way to remove the exceptions from a
recurring appointment in Outlook or is there a better way to do this? Am
I using the PIA the right way?

If there is any additional information needed that I haven't yet
provided, please ask.

Thanks in advance, this has been bugging me for days.

Chris

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        private void RemoveExceptions(Appointment appointment)
        {
            //Set Outlook API parameters
            Outlook._Application outlookApp = (Outlook._Application)new
Outlook.Application();
            Outlook.NameSpace mapiNamespace;
            Outlook.MAPIFolder olCalendar;
            mapiNamespace = outlookApp.GetNamespace("MAPI");
            olCalendar =
mapiNamespace.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderCalendar);

       //Get the appointment I want to edit from Outlook
            Outlook._AppointmentItem olAppointment =
(Outlook._AppointmentItem)mapiNamespace.GetItemFromID(appointment.OutlookId,
olCalendar.StoreID);

            mapiNamespace.Logon(null, null, null, null);

            for (//do some loop)
            {
                    //Get the item that is an exception and delete it
           try
                    {
                        Outlook._AppointmentItem item =
olAppointment.GetRecurrencePattern().GetOccurrence(//somedate);
                        if (item != null)
                            item.Delete();
                    }
                    catch (Exception){}
                }
            }
//Save and close the appointment
olAppointment.Close(Microsoft.Office.Interop.Outlook.OlInspectorClose.olSave);
            mapiNamespace.Logoff();
        }