Maximum PC: Stop whatever it is you're doing and make a fist. Make sure there isn't a living creature within arm's length, and when the coast is clear, pump your fist in the air in celebration. What are we celebrating? The fact that Microsoft today confirmed plans to make Windows 10 a free upgrade for Windows 7, Windows 8.1, and Windows Phone 8.1 users! This is exactly the type of announcement we were hoping for, but didn't really think would happen.