In an effort to convince the entire world to make the upgrade to Windows 10—or at least every Windows user—Microsoft offered the OS as a free upgrade to Windows 7 and Windows 8/8.1 users for the first year, and then continued to offer it for free through its assistive technologies page. Customers who user assistive technologies can still upgrade

Source: Hot Hardware – Here’s When Microsoft Plans To End Its Free Windows 10 Upgrade Offer