MoreLater this week Microsoft will provide more details of Windows 10, most likely focusing on how the new operating system will look and feel on smartphones and tablets.
According to Mary Jo Foley, Microsoft is likely to unveil a version of Windows 10 that's expected to work on Windows Phones and smaller Windows tablets running ARM and perhaps Intel processors.
Microsoft will be hoping that by making it easier for developers to build for tablets and smartphones it can take some of its dominance of the desktop world and port that to the mobile world.
That may help a bit, but will not in itself create the breakthrough that Microsoft wants: when it comes to mobile, Microsoft's Windows Phone is still a distant third in a two-horse race.
Microsoft is generally considered to have lurched too far towards mobile with Windows 8 in an attempt to head off the threat from tablets.