Just tried to download IE9 beta. And all what I got is:
Since you're running Windows XP, you won't be able to install Internet Explorer 9 unless you upgrade to a more recent version of Windows.
Is it only for beta? All my hopes were ruined...
migrated from stackoverflow.com Sep 15 '10 at 20:23
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It's true - at least according to several tech buzz articles linked to in the Wikipedia article.
That's quite rough, seeing as XP is still supported until 2014, but what are we going to do... If it's any consolation, Windows 7 is really great.