Disable no end date option in Outlook
You cannot disable the "No end date" option for appointments, meeting requests, tasks, or task requests in Outlook 2007
You create a new recurring appointment, meeting request, task, or task request in Microsoft Office Outlook 2007. When you set the range of recurrence, the No end date option is always available. You cannot disable the No end date option for appointments, meeting requests, tasks, or task requests.
