The purpose of the “Add a trusted certificate wizard” is to simplify the process of requesting and obtaining a trusted 3rd party SSL certificate for the SBS Web Applications website in IIS 7. This eliminates the need to use the native IIS 7 interface, which is more complicated and time consuming. However, this wizard only works with the SBS Web Application site. It does not submit or process certificate requests for any other website; in this case you must use the native IIS 7 console.
NOTE: The SBS Web Applications site contains all the Exchange virtual directories (AutoDiscover, OWA, Offline Address Book, ActiveSync, and Outlook Anywhere), Remote Web Workplace, and the configuration directory for the Vista client desktop gadget.
This wizard is used mainly to eliminate the need to distribute the SBS certificate installation package to your users; removing the certificate error prompts that users would otherwise receive when they do not trust the SBS 2008 server as a certificate authority. You must complete the Internet Address Management Wizard (IMAW) to configure your external domain name prior to running it.
You can access it in the Windows SBS Console under Getting Started Tasks on the Home tab. It’s also available when you click on your web server certificate under Network > Connectivity.