I have read this thread http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_23584461.html
and have a relates question.
I am getting lots of Event ID's 12014, 12015 and 12016
I have tried the Enable-ExchangeCertificate
command but get the following error message
WARNING: This certificate will not be used for external TLS connections with a FQDN of myserver.mydomain.com because the CA-signed cerificate with the thumbprint 'C80BB0395FF0E4D4258F689B7
ACB' takes precedence. The following connectors match that FQDN: Default MYSERVER, Client MYSERVER
The certificate installed with that thumbprint is for IMAP, POP and IIS services and is still valid. The certificate which has expired was for the SMTP service.