From ScottOs' blog - http://blogs.msdn.com/scottos/archive/2008/12/05/office-communicator-clients-cannot-communicate-with-contacts-homed-on-yahoo-messenger-network.aspx   Summary: Yahoo! will be undergoing an emergency maintenance from 4:30pm Read More

  Scott Oseychik 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 Read More