Internet Explorer 5.5 on Windows 95 looked like this: > Windows 95 browser agent string: Mozilla/4.0 (compatible; MSIE 5.5; Windows 95; BCD2000) Back then bro

Internet Explorer 5.5 on Windows 95 looked like this: > Windows 95 browser agent string: Mozilla/4.0 (compatible; MSIE 5.5; Windows 95; BCD2000) Back then browser agent checking was used a lot more. So a good reason to name it "10" instead of "9" is to differentiate it from Windows 95/98 for code that did things like: > browser.contains("Windows 9")