We renewed the SSL Certificate on our MS Exchange Server 2007. Users using MS Exchange with MS Outlook 2007/2010 kept working fine. Users using MS Outlook 2007/2010 with POP3 stopped receiving email.
We were forced to renew the certificate with new hash strength, from SHA1 to SHA2.
1. We checked our firewall. No changes made.
The only change was to replace the SSL certificate on the email server. We verified that POP was assigned as a service to the certificate thumbprint.
Any thoughts? SHA2 issue???