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Looking to buy an operating system? Check out the up-to-date catalogue of 6 webshops. At the moment, the $149.99 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 2012 Datacenter R2 EN. Compare prices and performance of all 581 operating systems, and don't forget to read our latest operating system reviews.