Renew an Exchange self-signed certificate:

This example renews a self-signed certificate on the local Exchange server,

Get-ExchangeCertificate -Thumbprint BC37CBE2E59566BFF7D01FEAC9B6517841475F2D | New-ExchangeCertificate -Force -PrivateKeyExportable $true

 

To find the thumbprint value of the certificate that you want to renew, run the following command:

Get-ExchangeCertificate | where {$_.IsSelfSigned -eq $true} | Format-List FriendlyName,Subject,CertificateDomains,Thumbprint,NotBefore,NotAfter

To verify that you have successfully renewed an Exchange self-signed certificate

Get-ExchangeCertificate | where {$_.Status -eq "Valid" -and $_.IsSelfSigned -eq $true} | Format-List FriendlyName,Subject,CertificateDomains,Thumbprint,NotBefore,NotAfter