So I've had PIC working for a long time and now AOL doesn't work. Nothing is wrong with MSN or Yahoo.....
If your school is using Public IM Connectivity with OCS Servers, you may not be able to communicate or see presence of AOL users.
AOL changed their root certificate. You can obtain the new Root CA 1 cert here: https://pki-info.aol.com/AOL/.
This cert needs to be in the trust list for the OCS server for the servers that connect to sip.oscar.aol.com.
Microsoft Customer Support Services has created a Windows Media Video to walk our customers through the process of adding this certificate.
So I've had PIC working for a long time and now AOL doesn't work. Nothing is wrong with MSN or