Exam 70-664 TS: Microsoft Lync Server 2010, Configuring (MCTS)Candidates for this certification should have a minimum of one year of experience installing, managing, deploying, configuring, monitoring, and maintaining Lync Server 2010, Office Communications Server 2007, Office Communications Server 2007 R2, or related technologies. In addition, candidates should have experience using and configuring Active Directory and network infrastructure components that support the deployment and ongoing management of Lync Server 2010 or Office Communications Server 2007 versions.
Exam 70-665 PRO: Microsoft Lync Server 2010, Administrator (MCITP). When you earn the MCITP: Lync Server 2010 Administrator certification, you help demonstrate your professional expertise in using Microsoft Lync Server 2010 to excel in a specific job role. This certification helps validate the knowledge and skills that are associated with being the lead messaging administrator for Lync Server 2010‒based messaging solutions within an enterprise organization, as well as the ability to design and deploy messaging solutions with Lync Server 2010
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Source: Microsoft Learning (here)