why do i have more than one "Sites" cert after updateing and expired cert.Can i delete the expired cert?????

Hi After getting the below message i updated my cert but now have 3 of the same certs? Can i delete the expired cert?????

There is no valid SMTP Transport Layer Security (TLS) certificate for the FQDN of SERVER.domainname.local. The existing certificate for that FQDN has expired. The continued use of that FQDN will cause mail flow problems. A new certificate that contains the FQDN of SERVER.domainname.local should be installed on this server as soon as possible. You can create a new certificate by using the New-ExchangeCertificate task.

I used "Get-ExchangeCertificate | Select CertificateDomains,Thumbprint,Status,Services | fl"to see which cert was expired

I used "Get-ExchangeCertificate –Thumbprint 91D4C277BE4DF5FA15FC76D936375B7766ABCC23 | New-ExchangeCertificate" to replace the expired cert

I re-ran "Get-ExchangeCertificate | Select CertificateDomains,Thumbprint,Status,Services | fl"to see if it had worked

but now i have two certs one expired the other not. Can i delete the expired cert?????