Re: Remind me again why Internet Explorer, itself, has anything to do with the Windows XP OS?
"No browser, not Chrome, not Firefox, not Opera, not Safari, etc., is considered part of the operating system."
Well, there you are wrong. As any knowledgable OS X user will tell you, Safari is a part of the OS. It comes with the OS. You can't really remove it. You can 'not use' it, but you could just as easily not use IE.
But, more importantly, Safari's engine, WebKit, IS a part of the OS, just like IE's engine is a part of Windows. It is used in many applications, and most people have no clue it is. For example, it's used to display mail content. And it is just as bad in OS X as it is in Windows. Because updating the browser to a new version (say go from Safari 4 to Safari 5) updates the OK because it updates Webkit (even though it doesn't have to, but Apple's people are too lazy to do it right). Which means, updating the browser literally can affect how your mail program views messages!
Oh, and you can get rid of IE from windows, big deal (sure, MS didn't want to because they wanted the market share for some reason). But you can't get rid of the engine without breaking a LOT of code.