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We know Microsoft is developing a number of Windows 10 versions for use on different hardware. How they will each stack up is a work in progress.
On January 21, Microsoft will stake out the future of Windows, giving us a glimpse of what its software will look like on mobile devices. A successor to Internet Explorer may also be in store.
At Microsoft's Windows 10 launch event, the company carries over its Cortana digital assistant from the phone to tablets and PCs.
You now get the chance to stream Xbox games from your console to your Windows 10 device.
PCs running Windows 10 will get Cortana
Microsoft is making Windows 10 friendly for computer-tablet hybrids.
It's still in development, but Microsoft is building a version of Windows 10 for smartphones and smaller tablets.
CNET's Kara Tsuboi and Nick Statt will be traveling to Redmond, Wash., for Microsoft's Windows 10 event January 21. In this Inside Scoop, they discuss the event itself and what Microsoft needs to do to ensure this product is a success.