I want to serve mobile content for browsers older than IE7. All I could find on Google was that the User Agent for IE 6 is "MSIE 6". What about IE 5 and below? And Netscape and early versions of FF and Opera?
This site has the user agent strings for most browsers (old versions and new versions). http://www.useragentstring.com/pages/useragentstring.php
Internet Explorer: http://www.useragentstring.com/pages/useragentstring.php?name=Internet+Explorer
Firefox: http://www.useragentstring.com/pages/useragentstring.php?name=Firefox
Opera: http://www.useragentstring.com/pages/useragentstring.php?name=Opera