The real problem with Windows Tablets
I am not sure what you mean by "Why hasn't there been Windows on a Tablet?"
There have been dozens of Windows Tablets since 2002. I have been using Windows tablets since 2003. I change Windows tablets about every other year to keep on top of the latest technology. I have had both slates and convertibles. Fujitsu Stylistic slate, Motion Computing slate, HP Compaq slate with removable keyboard, Lenovo X41 convertible, Lenovo X61 convertible, Fujitsu Lifebook convertible. I would never go back to a plain old laptop. Their performance has been great and has only improved with each new OS version. The only Windows tablet that was disappointing was the Lenovo X41 convertible. It would fall asleep on me every once in a while for no apparent reason. Once I removed Lenovo's ThinkVantage software from the device, I never had a performance problem. Apparently STINKVantage had a problem staying on a wireless network and it was constantly looking for software updates. UGH!
My current convertible tablet is a Fujitsu LifeBook running on Windows 7. It flies!
In my opinion, the real reason why Windows Tablets have not been successful is because the hardware costs too much for most consumers. "You mean I can get a decent Windows 7 laptop for $700 or a Windows 7 Tablet convertible for $1500? I'll take the regular laptop."
If Microsoft wants to enter the new less powerful, smaller, leaner, tablet market, they should dumb down the OS like the iPad and Android have. Make it leaner and remove the more advanced features and functionality. The average consumer doesn't need them or care about them.
