After working for hours on the, “Can’t sign in to Lync (2013) the server is temporarily unavailable ” issue, the solution turned out to relatively easy. Before I get to the solution, I will go into some detail with the troubleshooting I did.

Problem: When trying to sign into Lync 2013 our customer would get the following error: Can’t sign in to Lync  The server is temporarily unavailable. If the problem continues, please contact your support team. Only one user was affected all the other users’ Lync clients were fine. Continue reading →