Can I ask? If Windows 10 is FREE so it's product key is also free right? So, you mean you give the owner the product key to activate it. For exapmle, I have sony vaio laptop running windows 7 home basic then if I upgrade it to WIndows 10 the product key will change it still I used the home basic key.
It's just popped in my mind.. And also I'm curious about what will happen to my laptop if I upgrade it to Windows 10.
I really appreciate any help you can provide!