I was installing Lync Server 2013 Preview in my lab and while running Step 1 from the Deployment Wizard I got the following message:
I found the Additional Software Requirements TechNet article (http://technet.microsoft.com/en-us/library/gg398686(v=ocs.15)) that lists the additional software that needs to be installed with Lync. I found Windows Identity Foundation and the link in the TechNet article directed me to download the software from here:
After downloading the software and running the installer on my Windows Server 2012 Release Candidate Front End Server, I got the following error message:
Installer encountered an error: 0x80096002
The certificate for the signer of the message is invalid or not found.
After doing a little research, I discovered that Windows Identity Foundation is built into Windows Server 2012 Release Candidate as an additional Feature that you can add via Server Manager:
After selecting Windows Identity Foundation 3.5 from the Add Roles and Features Wizard, I clicked Next and then Install. Once the installation wizard completed I ran Step 1 from the Lync Server 2013 Preview again and this time Windows Identity Foundation passed the prerequisite check:
So if you are installing Lync Server 2013 Preview on Windows Server 2012 Release Candidate, make sure that you add Windows Identity Foundation from the Add Roles and Features Wizard!