MeetingItem.IsLatestVersion Property (Outlook)
Returns a Boolean value that indicates whether the MeetingItem represents the latest version of the item on the organizer’s calendar. Read-only.
This property applies to all MeetingItem objects including meeting requests, meeting updates, and meeting cancellation.
True indicates that the latest version of the meeting item is on the organizer’s calendar; False indicates that the meeting item on the calendar is not the latest version, or that there is a conflict between the meeting request and another appointment item on the calendar.