Microsoft Windows Server 2012 - license

If you want the flexibility of a private cloud, implementing solutions in a virtualized environment is not enough. Windows Server 2012 lets you go beyond virtualization to deploy and more securely connect to private clouds in a flexible IT environment that adapts dynamically to changing business needs. Enhanced features provide high performance and scalability to enable a truly multitenant infrastructure where networking, compute, and storage resources are isolated among tenants on the same host.