.NET: Get all Outlook calendar items

I’ve studied the docs and this is my result:
I’ve put a time limit of one month hard-coded, but this is just an example.

public void GetAllCalendarItems()
{
    Microsoft.Office.Interop.Outlook.Application oApp = null;
    Microsoft.Office.Interop.Outlook.NameSpace mapiNamespace = null;
    Microsoft.Office.Interop.Outlook.MAPIFolder CalendarFolder = null;
    Microsoft.Office.Interop.Outlook.Items outlookCalendarItems = null;

    oApp = new Microsoft.Office.Interop.Outlook.Application();
    mapiNamespace = oApp.GetNamespace("MAPI"); ;
    CalendarFolder = mapiNamespace.GetDefaultFolder(Microsoft.Office.Interop.Outlook.OlDefaultFolders.olFolderCalendar);
    outlookCalendarItems = CalendarFolder.Items;
    outlookCalendarItems.IncludeRecurrences = true;

    foreach (Microsoft.Office.Interop.Outlook.AppointmentItem item in outlookCalendarItems)
    {
        if (item.IsRecurring)
        {
            Microsoft.Office.Interop.Outlook.RecurrencePattern rp = item.GetRecurrencePattern();
            DateTime first = new DateTime(2008, 8, 31, item.Start.Hour, item.Start.Minute, 0);
            DateTime last = new DateTime(2008, 10, 1);
            Microsoft.Office.Interop.Outlook.AppointmentItem recur = null;



            for (DateTime cur = first; cur <= last; cur = cur.AddDays(1))
            {
                try
                {
                    recur = rp.GetOccurrence(cur);
                    MessageBox.Show(recur.Subject + " -> " + cur.ToLongDateString());
                }
                catch
                { }
            }
        }
        else
        {
            MessageBox.Show(item.Subject + " -> " + item.Start.ToLongDateString());
        }
    }

}