BigGwyn

Haven't you answered your own question there? There is a CU produced and available via a quick Goog Bing. You just need to download the CU and run it on each Lync Server and then perform the necessary PowerShell commands to update the databases in use???

Once the Preview client was released a number of us installed it. Once we installed the client we could not call Preview Client to Preview Client but calls from Preview Client to Lync 2013 worked without a problem. Uninstalling Office completely and reinstalling Lync without the Preview works perfectly again. Now the full release has come out, anyone allowing Windows Updates to install the client has the same issue. We are Microsoft Gold Communication partners and specialise in Enterprise Voice so we know what we are doing. Currently we have a ticket open with Support and were initially told we would have to wait for a patch!

Another easy question: Did the Skype for Business client get tested before deploying it to the world? In our work environment (Lync Server 2013 On Prem fully CUed) internal calls between the Preview Clients and also the full release do not work!