The new software represents an attempt to step back from the radical redesign that alienated many PC users when Windows 8 was introduced two years ago. But it's not a complete retreat from Microsoft's goal of bridging the gap between PCs and mobile devices. It still has touch-screen functions and strives to create a familiar experience for Windows users who switch between desktop computers, tablets and smartphones.

Microsoft executive Terry Myerson said Windows 10 will be "a whole new generation" and, as expected, will work across a variety of devices — from phones to gaming consoles.

Microsoft currently has three main systems Windows 8 for traditional computers and tablets, Windows Phone 8 for cellphones and Xbox for its gaming console. By unifying the underlying systems, software developers will be able to create apps for the various devices more easily. Consumers will also be able to switch devices more easily and avoid having to buy the same apps multiple times.

That doesn't mean the apps will look the same on the various devices. Developers will still be able to adapt apps for the various screen sizes, but won't have to start from the beginning for each version. User interfaces on the various devices may also differ, even as they share underlying technologies. For now, Microsoft plans to keep the current Xbox interface on the game console.

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