Exchange 2010 Import Certificate Error

Cannot import certificate. A certificate with the thumbprint xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx already exists.

Exchange Management Shell command attempted:
Import-ExchangeCertificate -Server 'E-Server' -FileData '<Binary Data>'
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Glen KnightCommented:
You will need to remove the duplicate certificate first by running the following command in the Exchange Managenent Shell:

Remove-ExchangeCertificate -thumbprint <thumbprint>

See here for reference:
Tahir-123Author Commented:

[PS] C:\Windows\system32>Remove-ExchangeCertificate -Thumbprint 76xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx8E

Are you sure you want to perform this action?
Remove certificate with thumbprint 76xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx8E from the computer's certificate store?
[Y] Yes  [A] Yes to All  [N] No  [L] No to All  [?] Help (default is "Y"): A
The certificate with thumbprint 7666554D80C570ABA825BBD7B48E126568676A8E was found but is not valid for use with Exchan
ge Server (reason: PrivateKeyMissing).
    + CategoryInfo          : NotSpecified: (:) [Remove-ExchangeCertificate], InvalidOperationException
    + FullyQualifiedErrorId : 780AD1AB,Microsoft.Exchange.Management.SystemConfigurationTasks.RemoveExchangeCertificat
Glen KnightCommented:
I would suggest going through the MMC.  Add the certificate snap in with local computer option.

Expand Personal and the certificate will be listed here (double check the thumbprint) and delete it.

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Tahir-123Author Commented:
Hi Demazter,
i removed the certificate using MMC and assign it again using EMC Pending Certificate Request but still the status didn't chang to assign services.
Glen KnightCommented:
When you completed the pending request did is say it was a success?

If so close and re-open the Exchange Console.  Any change?

Can you right click and select Assign Services?
Tahir-123Author Commented:
It was completed and show success but i cann't assign the service even with right click after re-open EMC.
Tahir-123Author Commented:
The Private Key was missed and we have fixed the problems
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