Microsoft will NEVER be run on ARM as we know it.
(1) Microsoft is and always will be unreliable.
(2) Unless ARM is going to try to compete with Intel and AMD head to head, ARM already is making money hand over fist in the Embedded market.
(3) ARM core is designed for mobile and low power, Windows was built for Desktop PC or Laptop with and AC adapter that runs for 2 hours on batteries.
(4) ARM core embedded use is for safety / medical / military use CAN NEVER USE WINDOWS. WILL NEVER BE CERTIFIED for any kind of use like that.
(5) Microsoft stopped "Innovating" 15 years ago
Microsoft unfortunately has become a bloated dinosaur. The WP7 is a to late. WHERE ARE TABLETS? I have to agree with the statement that Apple has shown us the less is more. How much resources does it take to write a 'simple' os for the ARM. I am sure that Microsoft will screw this up. If I were Ballmer I would setup 5 groups of 5 of my brightest programmers and give them 5 months to come up with a NEW OS. Then pick the best and immediately deploy it. Microsoft YOU CAN NOT WAIT 3 YEARS !!!
As to x86 not being the dominant CPU, I remember in the 90's how everybody was talking about WinNT on a PowerPC desktop machine with PCI slots becoming the next wave machine. Didn't happen. While there are aspects of Linux on a desktop that I like, it still is not ready for primetime compared to the Windows (Win7) universe. Time will tell.
Supporting another architecture would be a huge expense and I frankly don't see how MS would ever get a return on the investment. Also, if I developed a program I would need to validate it on the Intel and Arm platform. Again, I don't see the value. This seems like an insane idea.
I think the mobile revolution is a great opportunity to break the MS Windows monopoly of OSes, and I do not think the mobile market will make the same mistake of allowing a near monopoly of OSes. So, Android is the way for mobile. As for server-side OSes, Linux will eventually pevail. The added value will be in customisation, apps, and system integration.
What will be the advantage of having W8 and ARM?
In my point of view the devices that work well is because windows is not the OS used! ipad, ipod, cell phones (no win mobile).
W7 looks pretty but needs lots of resources and how come W8 is announced if W7 is receiving updates constantly!!!
more crap to the market!!!
I see more of a possibility that Windows Phone (or Tablet) 8 will slowly replace more devices that would've otherwise run Windows 8 Desktop.
More and more, what runs on the PC will become less relevant. But I doubt there will be a sharp transition.
The obvious thing to see is a Windows Pad based on the microsoft mobile (Zune). Look for future zune software to look like windows mobile software (a la ipod touch and iphone). My guess is that this is where the ARM is heading.
It makes total sense for Windows 8 to support ARM because ARM may very much become the MCU of the next generation computer regardless of mobile, laptop or desktop. Microsoft might already look into the market closely to determine how soon and when they will make Windows to support ARM. At the end of the day, market decides.