New IE7 Knowledge Base article: problem with website security certificates
Warning message when a user tries to connect to a secure Web site by using Internet Explorer 7: "There is a problem with this website's security certificate"
To be honest, I find this article to be unhelpful. It does not mention, for example, that Windows Small Business Server 2003 uses unsigned certificates by default, and that every organisation that uses OWA, and SBS's self signed certificate, is going to have this problem.
I blogged about the problem back in January 2006, have screenshots, and show you how to resolve the issue:
It is important to note that Windows Vista users will need to run IE7 as administrator to see the "install certificate" button.