Question : Sever Cert always invalid

I have two Exchange servers, one 2003 and one 2007. Both of them I issues certificates to from my DC acting as a cert authority. However, when users connect to either machine via Outlook Web Access https (instead of http) they get errors that the certificate is invalid and not trusted. How can I fix this?

Answer : Sever Cert always invalid

Unfortunately not, the only way around it is to use a commercially signed SSL certificate.