Contains a MAPI entry identifier used to open and edit properties of a particular MAPI object.
This property identifies an object for OpenEntry to instantiate and provides access to all of its properties through the appropriate derived interface of IMAPIProp.
This property is one of the base address properties for all messaging users.
This property can contain either a long-term or a short-term identifier. Short-term identifiers are easier and faster to construct, but are limited in their scope and duration, typically to the current session and workstation. They are commonly used for objects of a temporary nature, such as table rows or dialog box entries, and then abandoned. Long-term identifiers are used for objects of a more wide-ranging and long-lasting nature.
This property is always available through the IMAPIProp::GetProps method following the first call to the IMAPIProp::SaveChanges method. Some service providers can make it available immediately after instantiation. The provider must always return a long-term entry identifier from GetProps. Therefore, to convert a short-term identifier to long-term, simply open the object and get its this property through GetProps.