IM an Expert for Microsoft Lync Server 2010
IM an Expert is an instant messaging question and answer service that you can set up within your organization. With the IM an Expert service, you can use Microsoft Lync or the IM an Expert Welcome page to submit a question to the service. The IM an Expert service will locate an expert for you within your company and initiate an IM session between you and the expert who can answer your question.
Download it from here: http://www.microsoft.com/downloads/en/details.aspx?FamilyID=01fd2b2b-d780-4d6f-8e1e-54b2ad718f2b&displaylang=en
Documentation link: http://www.microsoft.com/downloads/en/details.aspx?FamilyID=8E4546AA-9B24-435D-9043-A2181B4E6D06&displaylang=en