Microsoft has been providing Windows 10 as a free upgrade for existing Windows 7 and Windows 8.1 users for the past year, but that's about to change. While 350 million devices are now running Windows 10, people will have to pay to upgrade from an older version of Windows soon. "After July 29th, we'll be moving to a $119 price," says Terry Myerson, Microsoft's head of Windows and devices, in an interview with The Verge. That means if you're on an existing machine you'll need to pay to upgrade, as Microsoft has been warning for months, or upgrade your machine hardware to get to Windows 10.