Open the ZIP file containing your certificate. Copy your_domain_name.cer the Office Communications Server where you you generated the CSR.
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On the server click Start, then Programs, then Administrative Tools, and then click Office Communications Server 2007.
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Expand the snap-in until you find the Enterprise Edition Server.
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Right click on the Office Communications Server where the CSR was generated previously, and click Certificates.
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Click "Next", then chose to "Process the pending request and install the certificate".
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Browse to your_domain_name.cer and click Next. This will install the certificate. You can view the certificate and close the certificate wizard.
Your SSL Certificate is now installed and ready to use.