IIS 6: Enable HTTPS for Multiple Web Sites
Once you have added the SSL certificate to your website(s), if not then head over to read IIS 6: Add a Certificate to a Website to see how.
If you have a wildcard certificate, enabling HTTPS on port
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