A very interesting announcement concerning PIC has been made:

"Customers with Office Communications Server 2007 R2 Standard CAL or Office Communications Server 2007/Live Communications Server 2005 SP1 Standard CAL with Software Assurance will no longer require an additional license to federate with Windows Live.  (A license will still be required for federation with AOL & Yahoo!.)"

more @ http://communicationsserverteam.com/archive/2009/07/01/537.aspx