Just a quick post to let you know about the certificate update for Lync 2013 coming June 1st 2013. Where Microsoft were using the GTE CyberTrust Global Root Certificate, they are now swapping to the Baltimore CyberTrust Root. This will be used for Mobile Push notifications to the Lync 2013 mobile app for use on your mobile devices.
There are two ways to ensure that when the switch over happens on June 1st your end users will see no issues –
1. Update the certificate chains via Windows Update – You can check this has been successful by checking in the ‘Trusted Root Certification Authorities’ Certificate Store on your Microsoft Facing Server.
2. Download the Baltimore CyberTrust Root from: https://cacert.omniroot.com/bc2025.crt.
Hope this helps!