Hide Meeting Update Option Property [Outlook 2003 API Reference]
Hides the option to send meeting updates to only added or deleted attendees.
A store provider that uses a server to send meeting updates can modify the Send Update to Attendees dialog box. This functionality is useful because when the server sends a meeting update, the server does not know which attendees have been added or deleted by the user since the initial meeting request. When this property is true, the Send update only to added or deleted attendees option is not displayed in the Send Update to Attendees dialog box.
This property is ignored if the version of Outlook is earlier than Microsoft Office Outlook 2003 Service Pack 1, or if its value is false.