This document provides an overview of Microsoft volume licensing for various products, including Windows Server 2012 R2, Remote Desktop Services, virtual desktop infrastructure (VDI), and desktop applications. It discusses licensing models, rights and restrictions for each product. For Windows Server, it explains processor licensing and the types of client access licenses (CALs). It also covers licensing requirements for using desktop applications remotely in a virtual environment, including ensuring compatibility of products, components, languages and versions between the accessing device and virtual instance.