But the company has a lot of work to do if it wants to catch up to iOS and Android.
Nokia's devices are Microsoft's now. But Nokia brings a lot more to the union, including design and app smarts that Microsoft dearly needs.
"Buy once, play anywhere" comes to Microsoft's ecosystem.
Even in beta, Microsoft's Cortana digital assistant has an impressive amount to say for itself. But is it enough to keep up?
The forward-looking folks at Microsoft Research demo'd Live Tiles that scroll and expand. It's still just an experiment, but it sure sounds cool.
The OS upgrade also includes new integration with Microsoft's OneDrive storage service.
Microsoft shakes up its business model without touching its cash cow.
Sprint has announced that it will support the Windows Phone 8.1 update for the HTC 8XT and Samsung ATIV S Neo.
Microsoft opens its Build 2014 conference by announcing everything from a rebirth of the Windows Start menu to universal apps.
The Lumia 930 is essentially the international variant of the recently released Nokia Icon, while the Lumia 630 and 635 are both mid-range Windows Phones.