I have a few questions on migrating from 2003 to 2010. The existing 2003 server is not using SSL for OWA. I will be setting up the 2010 server for SSL access. The company has one 2003 server and will have one 2010 server. What implications are there once I install the CAS with the 2003 server not using SSL? Forms-based authentication is not enabled on the 2003 server yet. I am planning to request the SSL from the 2010 server once I install the CAS role, then export/import it to the 2003 server so they can co-exist for a while. Will there be any down time for email while I am requesting/installing the certificate? Or can the 2003 server pretty much run by itself while I get the security set up?