MS has a history of doing this sort of stuff. For example, they deliberately fed Opera browsers broken CSS files: http://people.opera.com/howcome/2003/2/msn/ h

MS has a history of doing this sort of stuff. For example, they deliberately fed Opera browsers broken CSS files: http://people.opera.com/howcome/2003/2/msn/ http://people.opera.com/howcome/2003/2/msn/ Therefore, MSN looks for "Opera" in the User-Agent string and purposely sends Opera7 a style sheet which distort pages.