I have an sbs 2008 server, and I am trying to add a certificate I got from a trusted provider. When I attempt to add the certificate I get an error (see screenshot). Inintially when I got the certificate, I went thru the sbs management console, and clicked add a trusted certificate and chose the one for my domain, and it took it fine. Apparently I needed to add other types of certificate as well, (they all came in a zip file from the vendor). The vendor tech rep walked me thru some steps to add the certificates via MMC, and all went well. So I accessed my site externally, and still got the "this site does not have a trusted certificate" error. He said I might need to reboot the server for the certificates to take effect. Then he figured we might need to add the certificate thru IIS, which brought me to the current situation I am now in with the error. When the error first happened, the tech thought it might be because the server is looking for .cer files, and theirs come as .crt. So, he had me change the extension to .cer hoping the error would go away, it did not. HELP!!!