I see in the event log on our Exchange 2007 server ID code 12016 that there is no valid SMTP transport layer security certificate. When doing a get-exchangecertificate | list I see that there is a certificate that expired two days ago which has SMTP listed as the only service. However I recently renewed for 3 additional years from Go Daddy a certificate that amoung other services has SMTP. Do I need to get a new certificate for the expired SMTP only certificate? Or does the Go Daddy certificate that lists SMTP cover this? Should I just remove the old certificate that expired two days ago. Thanks.