Can Any Tablet OS Challenge Android And iOS?

Summary: Windows RT flopped but, seriously, is there any tablet OS that take on Android and iOS?

Based on Microsoft's latest earnings report, its Surface RT is a flop. This, in turn, means that Windows RT has failed. But, there are many other would-be tablet operating system challengers to Google's Android and Apple's iOS. Seriously, though, do any of them have a real shot?

Just over a third of Americans now own tablets. As time goes on, more and more of them will be buying tablets over PCs. By 2017, market research firm NPD predicts that we'll be buying six tablets for every single notebook. Of these tablets, most experts agree it's only a matter of time before Android is on top of the tablet mountain.