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Can I downgrade Vista Ultimate to Vista Business by changing the product key? (More details...)

I have Vista Ultimate registered to me. I also have Vista Business.If you go to System (Computer properties), at the bottom it shows you your product key and there is a link to change the product key.If I change it to a Vista Business one, will my Ultimate successfully downgrade to Business?

You can't downgrade between versions of Windows Vista.

And also note, that even upgrading doesn't work by changing the key in the System control panel. It works through a special program called Windows Anytime Upgrade.


No clean install only

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