Review Take a deep breath. This is it, the big one: Microsoft has released Windows 10, which will make everything good again after Windows 8.

Windows 10 is distinctive for several reasons. First, it introduces the "Windows as a service" concept, in which most users will automatically receive incremental updates with both feature and security patches. Second, it is a free upgrade for most existing users of Windows 7 or 8.1. Third, it is a multi-device operating system that runs on PCs, tablets, phones, HoloLens-augmented reality headsets, and miniature computer boards like Raspberry Pi.

 These various editions are unified by an application runtime called the Universal Windows Platform (UWP), which enables developers to code apps once and have them run on all the above devices as well as Xbox One. Different display sizes are catered for by a mechanism called the Adaptive UI, where the user interface adapts itself automatically to the size and orientation of the screen. UWP apps are deployed through the Windows Store, now unified across phone and PC, and users can buy an app once and run in on a variety of devices.

 

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