|Outlook Developer Reference|
Version Added: Outlook 2007
expression A variable that represents a PostItem object.
This event occurs after the Close event for the Outlook item occurs, but before the Outlook item is unloaded from memory, allowing an add-in to release any resources related to the object. Although the event occurs before the Outlook item is unloaded from memory, this event cannot be canceled.
|This event is meant only as a notification event, so that an add-in can dereference the object. An error occurs if any property or method for this object is called within the Unload event.|