I've heard you can activate Windows 10 with a key from 7 or 8.1 [1]. [1] https://arstechnica.com/information-technology/2017/05/windows-10-hits-500-million-dev

I've heard you can activate Windows 10 with a key from 7 or 8.1 [1]. [1] https://arstechnica.com/information-technology/2017/05/windows-10-hits-500-million-devices-growing-by-two-thirds-in-a-year/ https://arstechnica.com/information-technology/2017/05/windo...