// Create a new MapiCalendar item
var calendarItem = new MapiCalendar
{
    Subject = "Weekly Meeting",
    Location = "Conference Room 1",
    StartDate = DateTime.Now.Date,
    EndDate = DateTime.Now.Date.AddHours(1),
    Organizer = "Kate Crotty",
    Body = "Discuss project status",
    Recurrence = new MapiCalendarEventRecurrence
    {
        RecurrencePattern = new MapiCalendarWeeklyRecurrencePattern
        {
            DayOfWeek = MapiCalendarDayOfWeek.Monday,
            Period = 1,
            EndType = MapiCalendarRecurrenceEndType.NeverEnd
        }
    }
};