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Windows Server 2003 R2 Standard with SP2 English 1-4CPU with 5-Client *OEM 1-Pack*
By Microsoft

Microsoft Windows Server 2003 R2 Standard Edition helps you to increase the effectiveness of your computing operation while reducing IT costs. New features simplify and improve branch server management, storage management, and identity and access management. ... 

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Windows XP Pro with SP2C 32-Bit English DSP OEI *OEM 1-Pack*
By Microsoft

Windows XP Professional sets a new standard for performance and reliability. If you demand the most from your operating system, this version of Windows was designed for you. ... 

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Windows XP Pro with SP2C 64-Bit English *OEM 1-Pack*
By Microsoft

If you're looking for large amounts of memory and improved floating-point performance for tasks that rely on real-number data, such as mechanical design and analysis, three-dimensional (3-D) animation, video editing and composition, and scientific and high-performance computing, Windows XP Professional x64 Edition is designed for you. ...