Microsoft Windows 2008 Server Standard R2 with more than 5 Client Access Licenses - OEM Windows Server 2008 R2 extends the Windows Server 2008 operating system, providing a more efficient way to manage and control access to local and remote resources while easily integrating into your existing Windows Server 2008 environment. Windows Server 2008 R2 provides a scalable, security-enhanced Web platform, seamless interoperability with UNIX-based systems and enables new scenarios including simplified branch server management, improved identity and access management, and more efficient storage management.