@Ray7:OK, lets assume the cost of Windows is 50 per machine, do you think that's the most expensive thing in a tablet?.
And do you remember netbooks?, do you remember how they were cheaper because you did not had to pay the Microsoft tax?, do you remember how netbooks will be the rise of Linux?, but nothing happened, nobody care and people wanted Windows on their netbooks even if it cost more.
Not quite. The problem is not that folk wanted Window; they wanted their applications, and the Linux community (bless 'em) have never really understood the importance of getting high quality, easy-to-use applications.
The situation here is much different. As far as we can tell, existing Windows apps will not run on the new ARM stuff, which means MS will be trying to kick start a legacy-free platform. With the exception of the XBox (and I'm still not sure if that has recouped all the money they've spent on it), MS has yet to succeed at this.