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Looking to buy an operating system? Check out the up-to-date catalogue of 7 webshops. At the moment, the $189.99 Microsoft Windows 7 Professional 64-bit EN OEM is the most popular product. Other operating systems high on many people's lists are the Microsoft Windows 7 Professional 64-bit EN OEM and the Microsoft Windows Server 2016 Standard. Compare prices and performance of all 587 operating systems, and don't forget to read our latest operating system reviews.