Tablet computers (and similar devices) with screen sizes below eight inches which ran Windows 8/8.1, featured a traditional Windows desktop with legacy app support, alongside the ability to run the newer "Modern UI" Windows apps, but newer devices with sub-8-inch screens that run the newly introduced Windows 10 operating system, no longer have legacy app capability, and as such, can only run Modern UI apps downloaded only from the Windows App Store. However, most (if not all) owners of the older Windows 8 devices of that screen size class who upgrade to Windows 10, can still retain the old-style desktop and legacy app support, despite this upgrade.[4]