Hmmmm....last I knew, Windows was a brand of operating system made by Microsoft, neither of which produces computers/tablets.
Now, if you're talking about a Windows based tablet outselling Ipads, then that's a different story. Would they outsell Ipads in the current Windows form? Absolutely not. Do they have the ability to if they build a ground up, mobile based version of Windows? Possibly. Anything is possible. We can be driving flying cars next year, but it's not probably unless someone comes up with a new innovation.