I would like to implement Exchange 2010 EAS Certificate Based Authentication along with still being able to use Basic Authentication. Reason being is we are testing CBA and a small subset of people will use it at first. When configure CBA, Certificates need to be set to accept or require in the EAS properties of the CAS server along with unchecking Basic Authentication which would prohibit EAS from accepting the basic usernames and passwords. What is the best way of me trying to accomplish having both authentication methods work? Would I need a second ActiveSync virtual directory, one with a URL pointing the virtual directory that accepts BASIC authenticaiton, and another URL pointing to a second virtual direction that accepts Certificates only?