As this week ended, more screenshots of an alleged test build marked as “M3″ (Milestone 3) of Windows 7 leaked across the Web — something about which neither Microsoft nor some of its testers seem very happy.
Microsoft is believed to have begun releasing M3 builds inside and outside the company to selected testers starting around September 12.
To date, the Windows 7 team has managed to keep a fairly tight lid on test builds. while the M1 build of Windows 7 leaked widely starting at the end of 2007, the M2 build didn’t get much traction. But M3 builds seem to be making their way around; I myself saw one M3 build, thanks to a source of mine, earlier this week.