Installing with the Exchange Management Console
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Download and open the ZIP file containing your certificate. Your certificate file will be named your_domain_name.cer.
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Copy the your_domain_name.cer file to your Exchange server's network share folder (where you saved the CSR).
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Access the Exchange Admin Center by opening a browser and browsing to https://localhost/ecp
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Login using Domain\user name as the format for the user name and enter your password.
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Click the link to Servers in the left column, then Certificates at the top right.
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Select your certificate from the menu in the center of the screen (listed by its Friendly Name), and then click the "Complete" link located in the right column.
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Enter the network share path to where your certificate file is located
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The certificate should be successfully installed on the server.
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Now, to enable your certificate for use, go back to the Certificates section of the Exchange Admin Center, highlight the certificate you want to use and click the edit button.
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Click the Services option on the left side.
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Select the services for which you would like to enable your new certificate, click Save.
Your certificate should now be Installed and Enabled for use with Exchange.
After installing the new digital certificate for Exchange, in some cases, some computers running Outlook displays the error message "The name on the security certificate is invalid or does not match the name on the site" as follows::
In that case, you should perform the update URL to the Exchange in accordance with the following guidelines:
Guide to configure Exchange to use an official domain name (FQDN) instead of the internal domain name (Local name)
After successful installation, you can check the cert was install correctly or not by following tools:
https://cryptoreport.websecurity.symantec.com/checker/views/certCheck.jsp
