Sign in Windows Server R2 Windows Server R2 captures the experience Microsoft has gained from building and operating public clouds to deliver a highly dynamic, available, and cost-effective server platform for your datacenter and private cloud. The following information provides an overview of your key licensing options. Licensing editions Compare features in all editions to determine the ideal solution for your virtualization and cloud computing needs. Datacenter Datacenter edition is ideal for customers who want to have a highly virtualized private and hybrid cloud environment. As always, it provides access to all the product features and enables unlimited instances of Windows Server with each license, enabling your virtual environment to grow as you do. The licensing for Datacenter edition will continue to be processor plus CAL Client Access Licensewith each license covering up to two physical processors on a single server. Standard Standard edition is ideal for those customers who want to have a physical or lightly virtualized environment. This edition enables you to run up what is the price of Windows Server 2012 R2 Standard for students software? two virtual instances of Windows Server with each license and provides all the same features as Datacenter edition. The licensing for Standard edition will continue to be processor plus CAL, with each license covering up to two physical processors on a single server, just like Datacenter edition. Essentials Essentials edition is ideal for small businesses that have up to 25 users and want to have a simpler, pre-configured connection to cloud-based services.