I recently upadted to Windows Internet Explorer 7. In my opinion, they copied Mozilla in many ways, such as tabbed browsing, the search in the corner, and making add ons available for it.
I do however like it better than IE 6, but the only thing that really serves no purpose is the Phishing checker, It never really gives you a report of the site, it says “This Website has been sent to Microsoft for checking, in reality Microsoft probably doesn’t even see the report.