I'm using Microsoft's BPOS for hosted Exchange and have many users that just use the OWA interface. Rather than go to red001.mail.microsoftonline.com, I setup a CNAME, mail.domainname.com to point to that address.
My problem is that when the user uses the mail.domainname.com, they get a certificate error. If the user goes to red001.mail.microsoftonline.com, then no certificate error. I called Microsoft a few times and they said they couldn't help me.
I would like to continue using the mail.domainname.com as it is much easier for the users to remember. Any ideas?