RecurrencePattern.MonthOfYear Property (Outlook)
Returns or sets a Long indicating which month of the year is valid for the specified recurrence pattern. Read/write.
The value can be a number from 1 through 12. For example, setting this property to 5 and the RecurrenceType property to olRecursYearly would cause this recurrence pattern to occur every May. This property is only valid for recurrence patterns whose RecurrenceType property is set to olRecursYearly or olRecursYearNth.