I've recently procured a new SSL Certificate for my Exchange 2010 CAS box and I'd like to secure my External OWA page with it so I dont have to keep telling my users to "click continue to this website".
I've installed the certificate and this is fine, however when I bind https to the new certificate within IIS on the CAS server, and enable "Require SSL" on my OWA Virtual Directory all of my Outlook 2007 clients begin popping up with a "Certificate Warning"
Obviously this warning is telling me that the Internal URL of my Exchange CAS Box does not match the SSL certificate I applied to OWA.
THe problem i have is this: how can I install my SSL certificate and secure OWA without having to purchase another alternate name on the certificate. I know we can change the AutoDiscover URL to match the new domain name, which I'm fine doing but i'm concerned the effect this will have on my users.
It is worth bearing in mind I do have around 300 OUtlook 2003 users who dont get the certificate error.