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I renewed my certificate for my exchange 2010 box and I want to put the newest cert that I downloaded cer file) on the server. But it appears the only way to put in the renewed certificate is to complete a new CSR, which I have no interest in doing. Is there an easy way to pop this new cert in?

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certreq -accept should do the trick, have a look at this Micrisoft KB article

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What kind of file is it?

Could you add the cert through IIS?

Or what about "Import-ExchangeCertificate" Cmdlet for the Management Shell? If you got a pfx, you should be able to import through both the Management Shell and the Management Console.

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I received the renewed certificate in .crt and .p7b files format (without generating a CSR on Exchange). I don't have pfx.

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