Your network has Lync Server 2010 and Microsoft Office Communications Server 2007 R2 deployed. The network contains an Edge Server that runs Office Communications Server 2007 R2. Lync users report…

Your network has Lync Server 2010 and Microsoft Office Communications Server 2007 R2 deployed. The network contains an Edge Server that runs Office Communications Server 2007 R2. Lync users report that they are unable to initiate IM conversations to federated contacts. You verify that Office Communications Server 2007 R2 users can successfully initiate IM conversations to federated contacts. You need to ensure that all Lync users can successfully communicate with the federated contacts. Which two tasks should you perform? (Each correct answer presents part of the solution. Choose two.)