This document is a checklist designed for Managed Service Providers (MSPs) to facilitate successful network modernization. It categorizes essential steps by function, focusing on security compliance, network assessments, infrastructure readiness, growth and scalability, and migration expertise. The checklist emphasizes the importance of evaluating SD-WAN solutions, creating adaptable security policies, and offering unified threat monitoring to meet client needs. It outlines the necessity of defining key applications, prioritizing bandwidth requirements, and forecasting future needs to ensure scalability. Additionally, it highlights the significance of assessing current infrastructure, mobile and IoT endpoint support, and developing cloud migration roadmaps. The document also notes the growing market opportunities for MSPs in the managed services sector, particularly in relation to AI workloads and application modernization. Overall, this checklist serves as a comprehensive guide for MSPs aiming to enhance their modernization capabilities and remain competitive in a rapidly evolving market.