DigiCert SSL Cert Util SSL Import/Export Instructions

Exporting an SSL Certificate from one Microsoft Windows Server for Importing in Windows

If you wish to export an installed SSL certificate from a Micrsoft server type and it's corresponding private key as a .PFX file to use either as a backup or for importing to another server follow the instructions below. 
If you need your SSL Certificate in Apache .KEY format, please see the guide to Export an SSL Cert from a Windows Server to Apache with the DigiCert Util.

1. Download and Run the DigiCert Certificate Management Tool on the Microsoft server.
2. Select the certificate you want to export to a PFX file and click Export. 
   
    
3. To export this file to a Microsoft server type (e.g. IIS, Exchange, Office Communications Server, ISA, TMG) or other server/device that accepts a .PFX, .P12 file or PKCS#12 file leave all the options as their defaults and click Next. 
   
   To export the certificate to an Apache server or other software platform or device that requires that the private key and certificate files are kept separate, click the key file (Apache compatible format) option, then choose the location to save this file and click Finish. 
   
    
4. Create a new password that will need to be entered to import the certificate onto other servers and click next. 
   
    
5. Choose the location and filename where you want the PFX file saved and click Finish.
   

ref: http://www.digicert.com/util/pfx-certificate-management-utility-import-export-instructions.htm