Internet Explorer 7 has been retired from BrowserLab
Today we have pushed a minor new version of BrowserLab that no longer contains Internet Explorer 7. If you still need to test for IE7 in BrowserLab, you can do this using IE8 and a by adding bit of code to your page(s). To learn more about IE8′s Compatibility Mode, you can read about it in these Microsoft Blogs:
Remember to remove that code once your testing is complete, unless you want your IE8 visitors to see your page as they would in IE7.
Adobe BrowserLab product manager