I will be getting a free upgrade to Windows 10 July 29, like many others, which is "free for the life of the system" according to Microsoft. A month or so later, I hope to upgrade my 2500K cpu plus Z68 motherboard setup to a Skylake i5, necessitating a new motherboard with an 1151 socket. Does anyone know if I can use my new free windows 10 on it, or must I buy another copy since the motherboard was changed?