It isn't a secret that Microsoft is working on the successor to Windows 7, but the progress so far has remained a secret. Windows 8, the codename for the next major operating system from Microsoft, may have already passed Milestone 2 progress. According to a Russian website, via, Microsoft compiled the build "Windows 8 Milestone 2: 6.2.79xx.0.winmain_win8m2.xxxxxx-xxxx" recently. News of this build comes just days before CES 2011, meaning Microsoft might have a sneak preview for a select few, but the chances are very unlikely. The emerging details mean that Microsoft is already working on Milestone 3, which is expected to be completed by the end of February 2011. Not too many details have leaked out about Windows 8, but its new UI might be called "Wind," where Microsoft plans to create a 3D desktop. Other details suggest that Microsoft might be integrating Windows 8 to the cloud, selling the operating system as more of a service, making deploying and updating a simple task. Neowin will be live at CES 2011 this week in Las Vegas.