This update adds Windows Phone 8 compatibility to Lync 2010 for Windows Phone. Pelase refer to the following link for more information.
2778018 Description of the update package for Lync 2010 for Windows Phone: November 2012
Cannot connect on WP8 with an internal CA certificate installed on the phone. All WP7.5 devices function correctly in the same environment. Client will not connect with error DiscoveryFailedPastRoot.