Windows Server 2008 R2 Standard is a robust and reliable foundation on which to develop, deliver, and manage rich user experiences and applications. Windows Server 2008 R2 Standard provides a secure network infrastructure and reduces costs while increasing technological flexibility and value within your organization.

The Operating System for Large-Scale Virtualization and Scale-Up Workloads

Windows Server 2008 R2 Enterprise is an optimal operating system for servers running applications such as networking, messaging, inventory, databases, and customer service systems