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From the Exchange Management Shell

Get the current Certificate:

Get-ExchangeCertificate -domain "MAIL_SERVER_HOSTNAME" | fl

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


References

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

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