The build was compiled on March 17, 2017.

Windows 10 build 15063 for PC and mobile build 3.0 is now under testing.

Windows Creators Update is now getting closer to RTM build. The new Windows 10 Creators Update Insider build 15063 was compiled on March 17, 2017. Original Story: Microsoft’s Windows team is now testing Windows 10 build 15063 for PC and mobile build 3.0 internally. Microsoft has been providing several ways to upgrade to new version of Windows 10, such as from Windows 10 RTM / Windows 10 November Update (Build 10586) to Windows 10 Anniversary Update (14393), and this is expected to continue with Windows 10 Creators Update (Build 15063). Microsoft has been providing Windows 10 Update Assistant utility to help users who want to upgrade to new version of Windows 10 to upgrade immediately without waiting for it to be offered via Windows Update. The ‘finalized’ Windows 10 Creators Update will also be ‘released to manufacturing’ (RTM) and is the version installed by OEMs onto new PC. But we still expect Windows 10 Creators Update to ‘finalize’ at a build, with a major version number that sticks until the next major update and all updates in between only increases its minor revision number.

In fact, Microsoft has discouraged the use of term RTM, as Microsoft is expecting Windows 10 system to constantly be updated with Windows as a Service. Microsoft is yet to confirm Windows 10 Build 15063 is the RTM for Windows 10 Creators Update. Windows 10 Build 15063 is widely speculated to be the RTM build of Windows 10 Creators Update version 1703 as Microsoft is scheduled to release Windows 10 Creators Update to general availability soon in April 2017. Microsoft has released Windows 10 Build 15063 to Windows Insiders on the both Fast and Slow ring for PC and Mobile several days ago via Windows Update.