A few weeks ago The SSL Blog mentioned that Microsoft was scheduled to push IE7 using Automatic Updates to the remaining systems that hadn't gotten the push yet. This push is important because more systems than ever will receive IE7. The segments that weren't pushed as heavily in the past were corporate systems, double-byte languages, and systems without piracy protection enabled, at a minimum. Now with more than 100 million IE7 users worldwide, the push to remaining systems went on schedule.
As Microsoft's Craig Spiezle puts it,
Advancements like the ability to spot the green address bar when visiting a site protected by EV SSL Certificates as well as uncompromising protection from the phishing filter, which blocks one million attempts to visit phishing sites each week, are major differentiators for Internet Explorer 7.