A few weeks ago, I lost a domain controller in my network. Of course, it was a hard fail and I had no good backups. I thought I had finally recovered when I found that it must have been a CA, as there are certificates that had been issued by it on my domain controllers. I found this article and was working through it - http://support.microsoft.com/kb/889250. At one point it says to run "certutil - TCAinfo" and that is reporting the CA as a server that has been gone for nearly two years! I need to get a CA back up as I am trying to install Lync 2013, but I am a little stuck. What are the implications of installing a new CA now? I tried to export a certificate following instructions in another TechNet article, but it says the PK is marked as not exportable, so it will not let me create a .pfx file. Also, I saw that I should not install the CA on a Domain Controller, is that correct? All servers are 2008R2. Any thoughts or suggestions are greatly appreciated!