I've been using a self signed certificate with my Exchange 2007 server and want to move to a 3rd party certificate. The main reason for this is that my new HTC Imagio will not sync using ActiveSync and this certificate. So my question is when I purchase a certificate what is my best route? I want my users to be able to access Exchange via OWA thus I need owa.domain.com within the certificate but what will I need on the ActiveSync side? I am thinking servername.domain.com. Is that correct? I have a single Client Access Server.