Our Exchange and Transport servers are running Exchange 2007. Currently OWA is configured using a self-signed certificate from our mail server. I would like to issue OWA a new certificate from our root Certificate Authority. We also have an Edge Transport Server installed which I know uses the certificate to communicate with the email server. My question is, will changing the certificate on the mail server for OWA affect the Edge transport server or mail flow in general? Also, under the default website on the mail server there are several virtual directories one of which is OWA. Is it possible to just change the certificate on the OWA virtual directory or does this have to be done for all Virtual Directories under the default website? Thanks.