This document discusses lessons learned around virtualization technologies including vSphere, vCenter, VDI, and thin clients. It provides insights into sizing VDI deployments based on IOPs requirements for different operating systems. It also touches on best practices like removing all LUNs from a host before rebuilding it. The document outlines both challenges and positives of deploying VDI with thin clients, such as faster boot times but also limitations of certain USB devices and audio/video capabilities with RDP. Finally, it provides several resources for optimizing and troubleshooting VDI performance.