Microsoft recently pulled its update to move Windows RT machines to Windows RT 8.1. The company didn't disclose exactly why and only said that it's looking into a "situation."

"Microsoft is investigating a situation affecting a limited number of users updating their Windows RT devices to Windows RT 8.1," a Microsoft forum moderator explained. "As a result, we have temporarily removed the Windows RT 8.1 update from the Windows Store.  We are working to resolve the situation as quickly as possible and apologize for any inconvenience.  We will provide updates as they become available."

There appears to be no issue with the full version of Windows 8.1, which is still rolling out to users. Microsoft has struggled to show consumers why RT is even worth running, especially when Windows 8 and Windows 8.1 are much more powerful, and delaying an update like this only seems to make matters worse.