The lab environment used as examples was built using the same processes discussed in these three previous articles for Lync Server. Also note these instructions were tested various times with both RC and RTM installations of Lync Server. Although the process is basically the same as it was in Exchange 2007 and OCS 2007 R2 there are a few important changes. This article covers the Unified Messaging (UM) integration configuration between Lync Server 2010 Release Candidate and Exchange Server 2010 SP1.