I've got AIM on my computer because the folks I work for require it.
Just as a point of information, I use the version for Windows 95 because it's not nearly the memory hog that later versions are.It also works with Vista as well. It's pathetic, really, the way it whinges and begs and importunes you to "upgrade".
I also removed it from my start menu because having that trash trying to boot itself in the middle of all my other startup tasks is a huge pain in the ass. Of course, once you start it it reinstalls itself in the start menu and you have to remove it all over again, which is why I have the system configuration utility come up every time I start my computer.