Windows Central posted a story that members of the Windows Insider program will now have to have their Microsoft Account connected to their Windows 10 PC after the next preview build is released

Aul added that this change is just for members of the Windows Insider Preview only. People who upgrade their Windows 7 or 8.1 PC to Windows 10 when it launches on July 29 will not need their Microsoft account if they are not receiving Insider Preview builds. That also goes for PCs that have Windows 10 pre-installed.

Windows Insider members will get the final release version of Windows 10 on July 29 as just another build.

  Next Windows 10 PC Insider preview build will require Microsoft Account to be connected to PC