This handbook explains why application ecosystems have become too complex and costly to manage in-house due to skills scarcity, technical debt, hybrid architectures, rising security threats, and pressure to balance CapEx and ongoing OpEx. It summarizes key AMS trends such as rapid market growth, expanding cloud adoption, edge-driven data streams, and increasing need for stronger security and planning. The paper makes the case for outsourcing to improve uptime, scalability, agility, stakeholder satisfaction, and security maturity through 24/7 monitoring and access to specialized talent, while reducing downtime and operational burden. It also outlines core AMS components (service desk, incident/request handling, monitoring, lifecycle and release management, backup and recovery, and security)

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