This document outlines the steps for planning a large-scale deployment of Windows 10 and Office 365 ProPlus. It discusses assessing device and application readiness, preparing directory and network infrastructure, deploying Office and line-of-business apps, migrating user files and settings, implementing security and compliance capabilities, deploying OS updates, establishing processes for ongoing feature updates, and training users. The goal is to provide guidance on effectively transitioning from older desktops to a modern desktop-as-a-service model.