We are migrating from a one CAS Exchange 2007 environment to a Exch 2010 with multiple CAS servers with Load Balancing. Will I need a SAN cert for each of the new CAS servers? We use EAS on the 2007 CAS. Will I need a new cert there for the legacy EAS connection when EAS cimes through the new CAS 2010? We want to keep the same EAS domain name so as not to force users to change on their mobile devices. Can the new legacy cert on the 2007 CAS be from an internal CA? Sorry for all these questions at once but they are all related.