Hi Everyone,
I have a single Exchange box.
Was integrating my Lync and Exchange and noticed some issues after configuring my Lync pre-reqs: http://technet.microsoft.com/en-us/library/jj721919.aspx
Following the line of communication and event logs, I quickly saw that the error was not on my Lync Server, but on my Exchange. The "Microsoft Exchange Server Auth Certificate" that is created during Ex2013 install was missing. It was not there to give out tokens for the Server to Server authentication required to integrate Lync, Exchange, and Sharepoint.
Running Get-AuthConfig: http://technet.microsoft.com/en-us/library/jj215766(v=exchg.150).aspx pointed to a thumbprint that did not exist anymore.
I confirmed this by checking the local cert store (local computerpersonalcertificates), looking in the ECP (serverscertificates), and also running...