AIM has a web-based client that will allow a user to use AIM without installing anything.
The more that instant messaging creeps into our lives, the more we start to depend on it. With increasing security problems on PCs, more and more public systems are preventing people from installing software. How can you get your AIM fix without installing AIM?
AIM Express is a nice little web-based client that will allow you to use AIM without installing any software.
If that does not work, you can always use the older version called AIM Quick Buddy.
If you are in a library or at work and need a quick AIM fix, these links will keep in you in AIM space until you can get to a real client.