To add the Certificate Snap-in to Microsoft Management Console (MMC) in Windows Server 2003 follow the steps below:

  1. Click on Start -> Run… and enter mmc 
  2. Click on File -> Add/Remove Snap-in…

  3. Click on Add…

  4. In the list select Certificates and then click on Add

  5. Select Computer account then click Next

  6. Make sure Local computer is selected and then click Finish

  7. Click on OK

There you have it, the Certificate Snap-in will be shown. Once you are done using the Certificate Snap-in, close the Microsoft Management Console and choose not to save the Snap-in when prompted by Microsoft Management Console.