This Recommendation | International Standard is revised to make use of the enhanced message store defined in Rec. X.413 | ISO/IEC 10021-5. It also adds body part definitions for voice, reports and notifications. The ASN.1 has been fully revised to use the new ITU-T Rec. X.680 | ISO/IEC 8824-1 and ITU-T Rec. X.880 | ISO/IEC 13712-1, while retaining complete compatibility with the 1988 and 1992 IPM protocols. Numerous defect corrections are incorporated.