I proceeded to stand up my new Exchange 2013 CAS and Mailbox servers. Before having a chance to deploy SSL certs and configure the name space. People automatically started to receive SSL errors for the new servers. Autodiscovery is still pointed at the 2007 servers and does not find the new servers on Outlook "Test Email AutoConfiguration" and no one has been moved to the new Mailbox server. I also changed the Default Offline Address-book back to the 2007 servers. What causes people to authenticate to the new CAS servers, prompting with SSL errors?
Thanks in advance