Note: do NOT use the Certificates snap-in for the MMC to install the certificate. This will not work for Exchange 2007!

Show installed certificates:

Show installed certificates with details: Get-ExchangeCertificate | fl IsSelfSigned,NotAfter,Services,Status,CertificateDomains,Thumbprint,SerialNumber

Remove installed certificate:
Remove-ExchangeCertificate -Thumbprint "23423..."

Assign services to certificate:
Enable-ExchangeCertificate -Services 'IMAP, POP, IIS, SMTP' -Thumbprint '6c99cc...'

Un-assign services from certificate:
Enable-ExchangeCertificate -Services none -Thumbprint '6c99cc...'

If the certificate isn't enabled for the correct services (S=SMTP, I=IMAP, P=POP, U=Unified Messaging, W=Web/IIS

To renew self-signet certificate:
Get-ExchangeCertificate –Thumbprint “9E6DD4B4EA2865CA9E6C34B42329A9AC994EBF63” | New-ExchangeCertificate

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