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I have a certificate installed in IIS on my server. I want to use the same certificate in Exchange. All the documentation I can find talks about generating a CSR from PowerShel land importing the reply with PowerShell, but I can't do that because I already have a certificate.

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up vote 3 down vote accepted

If the certificate is already installed on the server, you need to assign it to Exchange services; this can be done from the Exchange Management Console (in the "Server Configuration" node), or from the Exchange Management Shell using the Enable-ExchangeCertificate cmdlet:

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Use the Export-Exchange Certificate cmdlet to generate a copy of the certificate for importing to another server, client computer, or device.

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