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. Building upon the increased security, reliability, and performance provided by Windows Server 2003 Service Pack 1 (SP1), Windows Server 2003 R2 extends connectivity and control to local and remote resources. Organizations can benefit from reduced costs and increased efficiencies gained through enhanced management and control over resources across the enterprise. Windows Server 2003 R2 allows you to maintain the performance, availability, and productivity benefits of a local branch office server while avoiding issues typically associated with branch office server solutions such as connectivity limitation and management overhead. Windows Server 2003 R2 includes Active Directory Federation Services, which is designed to help administrators address identity management challenges by making it possible for organizations to share a user's identity information more securely across security boundaries. Windows Server 2003 R2 also provides UNIX password synchronization, which helps integrate servers running Windows and UNIX by simplifying the process of maintaining secure passwords. Windows Server 2003 R2 includes new tools designed to provide a centralized view of storage; simplified storage planning, provisioning and maintenance; and improved monitoring and reporting. Windows Server 2003 R2 enables businesses to extend their infrastructure over the Web while reducing development and management costs through enhancements delivered with Windows Server 2003 SP1, x64 Editions, Windows SharePoint Services, .NET Framework 2.0, and Internet Information Services 6.0. The Reseller Option Kit enables your customers to choose their preferred ProLiant server with the operating system of their choice. This product is BIOS-locked to HP server and should be delivered with HP server.