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Looking to buy an operating system? Check out the up-to-date catalogue of 10 webshops. At the moment, the £621.46 Microsoft Windows Server 2012 Standard EN is the most popular product. Other operating systems high on many people's lists are the Microsoft Windows Server 2012 Standard EN and the Microsoft Windows 10 Pro 64-bit EN. Compare prices and performance of all 586 operating systems, and don't forget to read our latest operating system reviews.