.:Dark Prince:. said:

That's all that comes to mind, really.
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And yet MS never managed to actually release a successful product to market. Hint: it's not because the world is full of MS haterz. In 2002, they had well over 90% of the desktop market.
Instead they built tablet functions into Windows, which leads us to Windows 8, 10 years later.
And really, the tablet PC is an evolution of the PDA, which begat the smartphone. And of course, everyone remembers the big ball of win that was the Apple Newton. Just like the Tablet PC, the underlying technology and the market to make them commercially viable just weren't there at the time.