In Exchange 2010 I create a "New Exchange Certificate" with appropriate services configured for webmail and a certificate request file is generated.
In Server configuration under Exchange Certificates tab the status for the certificate I created is in "This is a pending certificate signing request (CSR)."
I browse to the web URL for my local CA and login as a Domain Administrator
Request a Certificate >
advanced certificate request >
Submit a certificate request by using a base-64-encoded CMC or PKCS #10 file, or submit a renewal request by using a base-64-encoded PKCS #7 file.
On the Submit a Certificate Request or Renewal Request page I copy the contents of certificate request file into the Saved Request field. Then I select Web Server for Certificate Template.
When I select Submit> button it clears the form and does not display the Certifcate Issued page so it can be download to complete the pending request.
I am accessing the CA using IE 8. I was sucessful with this task creating a certificate for VPN connections.