From a Windows 10 market momentum snapshot; also see Windows 10 is rapidly gaining on Windows XP (SiliconAngle) -- reminder: Windows XP was released in 2001
"Windows 10 marked the culmination of a years-long effort to bring together the company’s operating systems for phones, tablets and PCs — something rivals Google and Apple have yet to do.Windows 10 Brought PCs and Phones Together, but Do Users Care? | Re/code
Not only can a single Windows 10 app run on desktop and mobile, but also on the Xbox and Microsoft’s upcoming HoloLens augmented reality headset. With the right adapter, phones running Windows 10 can even turn into a basic computer by plugging into a keyboard, mouse and monitor.
The key question for 2016 is whether anyone cares anymore."