Windows 8 Milestone 1 Build 7504
Microsoft has already started working on Windows 8, Build Number is Build 7504.0.amdfre.winmain.090528-xxxx ,though it’s still to confirm whether the build is legit or not.It is to note that the earlier builds of Windows has build number of the previous OS so they would represent Windows 8 as Windows 7 in earlier stages.
Here is the screenshot.
