My domain name for internal and external are different. ex:
I purchased a UCC cert through digicert but now I am getting the certificate pop up. if I hit yes to proceed, then EVERYTHING works fine, but it pops up every time outlook is opened. it is the "The name on the security certificate is invalid or does not match the name of the site. If I install the certificate I am ok but of course I do not want users to see the invalid error message.