http://www.microsoft.com/en-us/download/details.aspx?id=39071
This guide assists Lync Server administrators in setting up Lync-Skype connectivity
Since the end of May 2013 Skype and Lync customers around the world are now able to connect with each other from across these platforms. With Lync-Skype connectivity, Skype users can reach a broader contacts who are useLync, Microsoft’s unified communications platform, to connect them into organizations of all sizes. Lync provides a consistent, single client experience for presence, instant messaging, voice, video and meetings for business productivity and is owned by over 90 of the Fortune Global 100 companies.
All you need to connect with your contacts on Lync is the latest Skype client, available from Skype.com, and a Microsoft account. Connectivity is currently supported by Windows and Mac desktop clients, with more options coming soon as other clients are updated.
