Interested in checking out the new web platform capabilities of Internet Explorer 9? Try the Internet Explorer Platform Preview!
Internet Explorer Platform Preview requires Windows Vista or Windows 7. Feel free to explore our Test Drive demos in your current browser.
Welcome and thank you for investigating Internet Explorer Platform Preview. A new version is available for download.
Welcome and thank you for investigating the fourth Internet Explorer Platform Preview.
Check back often; we update the Platform Preview regularly and add more demos all the time.
Wow! You’re already running IE9!! Thank you for testing our Internet Explorer Platform Preview test drive

Because all of the previous versions of IE have been so impressive and worked flawlessly.