Defines interpersonal messaging, a form of message handling tailored for ordinary interpersonal business or private correspondence. The following topics are covered: information objects, associated abstract service and how it is provided. This Standard is identical with and reproduced from ISO/IEC 10021-7:1990, and includes Technical Corrigendum 1:1991, Technical Corrigendum 2:1991 and Technical Corrigendum 3:1992.