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ItemEvents_10_Event.CustomPropertyChange Event

Occurs when a custom property of an item (which is an instance of the parent object) is changed.

Namespace:  Microsoft.Office.Interop.Outlook
Assembly:  Microsoft.Office.Interop.Outlook (in Microsoft.Office.Interop.Outlook.dll)

event ItemEvents_10_CustomPropertyChangeEventHandler CustomPropertyChange

The property name is passed to the procedure so that you can determine which custom property changed.