Today, your Lotus Sametime Gateway integrates directly with the Yahoo! Messenger servers through single sign-on capability, letting your employees use their corporate Sametime identity to exchange presence information and text chats with Yahoo! Messenger users. Yahoo has notified IBM that it intends to discontinue this method of interoperability in the near future.
http://www-01.ibm.com/support/docview.wss?uid=swg21449088
