manastungare writes "A friend pointed me to Microsoft India's Vista Promotion, which I tried to access using Safari on my Mac. I got back a page that contained an infinite redirect loop. Upon changing the user-agent string to MSIE/Windows, the same page loaded with no errors. Microsoft have pulled this trick in the past during the launch of Windows XP (and again, and again). Why do they keep discriminating against browsers that are perfectly capable of handling their content?"