Microsoft Windows 2003 Server Standard R2 with 5 Client Access Licenses - OEM Windows Server 2003 R2 extends the Windows Server 2003 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 2003 environment. Windows Server 2003 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.