Surface devices sold since July 29, 2015 ship with the Windows 10 operating system. Also, up to July 2016, older models which shipped with Windows 8.1 were eligible for a free upgrade to Windows 10.
The original Surface and Surface 2 models use Windows RT, a special version of Windows 8 designed for devices with ARM processors and cannot be upgraded to Windows 10. However, there were several major updates made available after its initial release that include Windows RT 8.1, RT 8.1 Update 1, RT 8.1 August update, and RT 8.1 Update 3. These older, ARM-based models of Surface are not compatible with Windows 10, but received several new features including a new Start menu similar to that found in early preview builds of Windows 10.
From Surface Pro 4 and onward, all Surface devices support Windows Hello facial biometric authentication out of the box through its cameras and IR-sensors. The Surface Pro 3 can utilize the Surface Pro 4 Type Cover with Fingerprint ID to gain Windows Hello support.
Disclaimer: This content is copied from Wikipedia.
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