At the Build conference in San Francisco, Microsoft has unveiled Windows 8.1. The Windows 8.1 preview is available to download and install right away, and it will be a free upgrade for Windows 8 users when the final build is released in the fall. The overarching goal with Windows 8.1 is to make the operating system more usable on tablets, but also to improve the quality of life for mouse-and-keyboard users. To this end, Windows 8.1 sees the return of the Start button (but not the menu), the option to boot to the Desktop, and built-in search, SkyDrive cloud integration, and the Windows Store have been much improved.