In addition to server licensers, you can’t forget the processor licenses. Each processor on a server that your software uses requires a separate license. For physical operating systems, each physical processor must be licensed. However, for virtual environments, only virtual processors the software uses must be licensed under Microsoft’s licensing terms and conditions. You do not need CALs or EC licenses because per-processor licensing allows any number of users to access the software from any number of devices. You may run any number of instances in licensed physical or virtual operating system environments.