IIS 6: Add a Certificate to a Website
If you have not already done so, add your website certificate by importing it into Windows Server 2003 by read the following post: Windows Server 2003: Import a Certificate into MMC.
To add your certificate
Windows Server 2003: Import a Certificate into MMC
If you have not added the Certificate Snap-in to Microsoft Management Console (MMC) then visit the post Windows Server 2003: Adding the Certificate Snap-in.
To import a certificate provided by your domain