Windows Server is the cloud-ready operating system that supports current workloads while introducing new technologies that make it easy to transition to cloud computing. It delivers powerful new layers of security along with Azure-inspired innovation for the applications and infrastructure that power your business. This is a three-year subscription to a pack of 8 core licenses, with a minimum of 8 core licenses per physical processor or virtual machine and a minimum of 16 core licenses per server. This purchase includes Azure Hybrid Benefits for Windows Server enabling you to run in Azure Windows Server VMs at the Linux rate. You also need to purchase Windows Server Client Access Licenses (CALs) for every user or device accessing the (physical) server.