Address book notifications allow a client to learn of events that occur to any address book entry or to a particular entry. You can register for these notifications either through the MAPI address book by calling IAddrBook::Advise or through an address book container's hierarchy or contents table by calling IMAPITable::Advise.
Specify the entry identifier of an address book container, distribution list, or messaging user if you are registering for notifications on a particular entry and NULL if registering for notifications on the entire address book. The entry identifier must represent a messaging user or distribution list in an address book container. IAddrBook::Advise examines this entry identifier to determine which address book provider is responsible for the corresponding object and forwards the call to the appropriate address book provider's IABLogon::Advise method.
Clients can register for the following types of events on address book entries:
Typically, registration occurs only on address book container contents and hierarchy tables. It is rare that clients register with the lower level messaging user and distribution list objects. This is because: