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Describes information that relates to an event that is service provider-specific.
The EXTENDED_NOTIFICATION structure is one of the members of the union of structures included in the info member of the NOTIFICATION structure. When the info member of a NOTIFICATION structure contains an EXTENDED_NOTIFICATION structure, the ulEventType member of the NOTIFICATION structure is set to fnevExtended.
The extended event is defined by a service provider to represent a type of change that cannot be covered by any of the other predefined events. Only clients that know before they register that a service provider supports an extended event can register for that event. It is not possible for clients to determine without advanced knowledge if a service provider supports an extended event. If a service provider supports an extended event, it shows how to handle such an event when it is received.
An extended notification is sent by the session when a client logs off. Register for this notification by calling IMAPISession::Advise with the lpEntryID parameter set to NULL and the cbEntryID parameter set to zero.
For more information about notification, see the topics described in the following table.