Don't even bother trying to upgrade to Windows RT 8.1 today
If you're one of the few people who own a Windows RT tablet (don't all raise your hands at once, now), you just got a chunk of your Saturday back. Citing a "situation affecting a limited number of users updating their Windows RT devices to Windows RT 8.1," Microsoft has pulled the upgrade from the Windows Store. The company hasn't supplied an explanation, though various sources cite boot configuration issues that can cause the update to fail. Microsoft says it is "working to resolve the situation as quickly" and "will provide updates as they become available."