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Get Current Certificate Info

From the Exchange Management Shell

Get the current Certificate:

Get-ExchangeCertificate -domain "MAIL_SERVER_HOSTNAME" | fl


Create a New Certificate

Generate a Certificate with a new expiration date:

Get-ExchangeCertificate -thumbprint "CURRENT_CERT_THUMBPRINT" | New-ExchangeCertificate

If the current Certificate is in use then you will be prompted to overwrite it.


View the new Certificate

Get-ExchangeCertificate -thumbprint "NEW_CERT_THUMBPRINT" | fl


Enable New Certificate for IIS

Enable-ExchangeCertificate -thumbprint "NEW_CERT_THUMBPRINT" -services IIS

Delete old Certificate

From the Exchange Management Shell

Remove-ExchangeCertificate -thumbprint "OLD_CERT_THUMBPRINT"


References

http://exchangepedia.com/2008/01/exchange-server-2007-renewing-the-self-signed-certificate.html