Try Windows Vista Online in your Web Browser Without Downloading Anything

If you want to run Windows Vista on your computer without disturbing the existing setup, the best option for you is to download a free copy of Virtual PC and install the associated Vista virtual image*.
Now if that sounds a bit complex, here’s something more simple for you that requires no downloads or complex setup.

Called the "Windows Vista SPI Ultimate Test Drive", this product from TechNet Virtual Labs let you test Windows Vista online inside a browser without making any changes to your current work environment.
To experience it live, just go to windowsvistatestdrive.com. You get a chance to explore all features / programs included in Windows Vista (including games) and also Microsoft Office Profession 2007 as you may noticed in the screenshot.
www.windowsvistatestdrive.com