I thinkt hey will upgrade you for free for the first year, but then you have to pay a yearly license feee....
I don;t trust MS
Incorrect. Microsoft is giving everyone on Windows 7 and 8 the opportunity to upgrade to Windows 10 free-of-charge for 1 year from the date of public distribution (later this month). After that time, you'll have to pay an upgrade fee, as has been typical with previous Microsoft operating systems.
Of the "big 3" operating system programmers, which do you trust most: Apple, Google, or Microsoft? Why?