Scott blogged about the AOL update for the root authority and where to get the update for your LCS and OCS Edge Servers.

http://blogs.msdn.com/scottos/archive/2008/12/02/office-communicator-clients-cannot-communicate-with-contacts-homed-on-aol.aspx

 

I would suggest adding Scott's site to your reading list as his role in escalation services means he is always looking at issues that most of the time result in a bug with fix. Plus he's just a great guy.

 

Tom LCSKid