So as an experiment I tried connecting to @Wildman_Fujiami’s AIM server using the included AIM client that comes with Netscape 7.1. I was able to sign in and talk to friends! I will provide a screenshot below.
File Transfers (needs to be retested!)
Everyone will appear offline when they actually are online (sometimes)
(I have not found any other bugs.)
If you want to try this, finding a Netscape 7.1 installer will be hard. I will provide a link when I find one.
UPDATE: I tested 7.0 and it works too!