We have several clients who run Exchange for their orginizations mail. For OWA access I am using a certificate issued by the Domain Controller in the domain which works just dandy in Internet Explorer 6. In Internet Explorer 7 a screen comes up saying that the certificate is not from a Trusted Certification Authority so the site is not safe. I cannot for the life of me figure out how to stop this behavior. I have added the OWA website into the trusted sites list. I have tried importing the certificate into the Root Certification Authority but it wont take it. Any ideas?