This Recommendation | International Standard defines the Message Store abstract-service. This abstract-service is provided by the Message Store access protocol (specified in ITU-T Rec. X.419 | ISO/IEC 10021-6) in conjunction with the MTS abstract-service (defined in ITU-T Rec. X.411 | ISO/IEC 10021-4), together with the Remote Operations Service Element (ROSE) services (defined in ITU-T Rec. X.219 | ISO/IEC 9072-1). The abstract-syntax for the application-layer protocols used in this Recommendation | International Standard is defined in ITU-T Rec. X.680 | ISO/IEC 8824-1.