Really? Why is that?

>Good thing you're not an attorney because it depends on how the EULA is written. How many web-based services, say Facebook, Ebay, etc, have you signed up for where they EULA changes? But it is different for "shrink wrapped" software.
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>>This may not be helpful, and I am not an attorney. but there is no way to legally change an EULA once issued. IOW if you purchasedthe software under terms X,Y, and Z, it is not legally permissible for MS to change those terms to your detriment.