Windows Server 2008 R2 Datacenter
Windows Server 2008 R2 Datacenter Edition with SP1 is optimized for your large-scale virtualization of workloads that require the highest levels of scalability, reliability, and availability to support large, mission-critical applications.
With unlimited virtualization use rights and a hypervisor-based virtualization technology, Windows Server 2008 R2 Datacenter provides both flexibility and cost savings. Windows Server 2008 R2 Datacenter also supports the memory and processing needs of large-scale, business-critical workloads such as ERP,
databases, server consolidations, and custom and line-of-business applications. Windows Server 2008 R2 Datacenter includes Hyper-V, a flexible high-performance hypervisor-based virtualization technology.