Thanks to garrikfox in our forums for the hint. Windows XP Professional x64 Edition RC 1 is available for download on Microsoft website. If you want to play a bit, add if free to your Cart Quote:Note: The Windows XP Professional x64 Edition - CD will not be available until approximately late February. If you prefer to not wait for the CD version, you are welcome to continue to process your order for the download version. Windows XP Professional x64 Edition is designed to address the most demanding business needs of technical workstation users who require large amounts of memory and floating point performance in areas such as mechanical design and analysis, digital content creation, and scientific and high-performance computing applications.