Microsoft seeds Windows 10 Build 10240 to testers

Microsoft seeds Windows 10 Build 10240 to testers

Build 10240, widely regarded as the 'RTM' build, is now available to Insiders on both the Fast and Slow rings.
Microsoft to suspend Windows 10 preview builds briefly as it prepares for the official release

Microsoft to suspend Windows 10 preview builds briefly as it prepares for the official release

And according to the latest rumor, Microsoft has signed off Windows 10 Build 10240 as the RTM build.
Windows 8.1 to RTM in Late August (Update: RTM!)

Windows 8.1 to RTM in Late August (Update: RTM!)

Microsoft has confirmed that Windows 8.1 - the first major update to Windows 8 - will RTM (release to manufacturing) at the end of August. Update: Microsoft has just announced today - August 27 - that the OS has been released to manufacturing.
Windows 8 Reaches RTM

Windows 8 Reaches RTM

Microsoft has announced that Windows 8 has reached the RTM stage. This milestone signals the completion of product development and testing, and the handing off of the final code to hardware manufacturers as they prepare for its October 26 general availability.