This book constitutes the thoroughly refereed post-proceedings of the First International Service Availability Symposium, ISAS 2004, held in Munich, Germany in May 2004.The 15 revised full papers presented were carefully selected from 28 submissions during two rounds of reviewing and improvement. Among the topics addressed are high availability database architectures, data persistence, dependable mobile Internet services, System Availability Forum standards, QoS control, middleware, service-level management, service management, location-based services, service robustness, service availability...