Browser Sandbox is no longer available
There are many other browser compatibility tools that may be of interest.
Easy Cross Browser Testing
The Spoonium Browser Sandbox makes cross-browser and backwards compatibility testing easy. Just click Run for any browser to launch it instantly.
Browsers run within an isolated virtual environment, eliminating the need for installs and allowing legacy browsers such as Internet Explorer 6 to run on Windows 7 and 8.
Virtualized browsers behave exactly like installed browsers. And because they run locally, you can test web applications hosted on your own development machine or on internal servers. Simply launch the browser from Spoon.net or the Spoon Console and enter your test URL in the navigation bar.