Lync Online Certificate Updates

Microsoft will soon be updating the root certificate chain used for Lync Online. This may impact you if you use Lync Online (as opposed to Lync Server, on premise).

If you use Lync Online (part of Office 365), you should ensure that all your Microsoft facing servers are updated to trust the new root certificate chain.

For more information see this post: http://blogs.technet.com/b/nexthop/archive/2013/05/13/action-needed-lync-online-certificate-update.aspx