This document provides an overview of modernizing enterprise applications with Azure Platform-as-a-Service (PaaS). It discusses reasons why businesses modernize like reducing technical debt and optimizing costs. It also covers challenges of modernization like fragmented security and conflicting priorities. The document then presents different approaches to application migration and modernization on Azure including migrating to IaaS, replacing with SaaS, staying on-premises but connected to cloud, and modernizing directly on PaaS. Key benefits of a successful modernization are also listed like prioritizing security, resilience, and performance as well as innovating faster. The document concludes with case studies of companies successfully modernizing applications on Azure.