Entry Identifier Identifies Specific Object for Notification
An application can register to receive notification of the deletion of an object in any of three ways:
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In the call to Advise, pass the entry identifier of the particular object, whether it is a folder object or a message object. To receive notification of the deletion of a message within a folder, the application must be registered for notifications about the message itself, not the folder that contains it.
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Pass NULL in the Advise call to request notification of all deleted objects in the information store.
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Register for table notification on a contents table of the folder.