Genuine Win7/8.1 users reinstall Win10 how to activate?

  

According to Microsoft policy, all Windows Insiders test users and genuine Windows 7/8.1 users can upgrade for free after the official release of Windows 10. So the question is, in the case of completely reinstalling the system, how does Windows 10 determine whether the user's device meets the “free upgrade” condition?

Gabriel Aul, the person in charge of Windows Insiders, explains this. Windows 10 has an "Activation Service" that detects whether the user's original device contains genuine license information for Windows 7/8.1. Once detected, Windows 10 will be automatically installed and activated without user intervention. You do not need to enter the previous Windows 7/8.1 activation code again.

In other words, genuine Win7 and Win8 users, reinstall the system without worrying about activation issues.

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