Windows 8.1 Update, the oddly-named newest version of Windows that makes Windows 8.1 much more friendly to keyboard and mouse users, has officially started rolling out from today. It's a free update for Windows 8.1 (and 8) owners, but you might not see it show up immediately on your system.
Microsoft is pushing out 8.1 Update as a staged rollout, a process which it says might take a few weeks. It's absolutely worth doing if you use anything other than a tablet with Windows 8 (and even in that scenario there's nothing to lose). Welcome back, close button!
Why I love today’s Windows 8.1 Update [Windows Experience Blog]