New in v7.0: Various layout changes (including ability to reorder tabs and new e-mail button on toolbar), upgraded RSS feed reader (ability to mark feeds as having been read and option for automatic feed updates), rendering and other bug fixes, various security patches; Release Notes - Last Updated: 10.05.07 (v7.0.5730.13)
New in v7 Beta 2: Tabbed browsing (with Tab Groups), integrated RSS support (feeds), better standards compliance, built-in phishing filter, advanced security (cross-domain script barriers, International Domain Name Anti-Spoofing protection, etc.), option for deleting browsing history by removing user-identifiable information; Release Notes - Last Updated: 04.25.06 (v7.0 Beta 2 - v7.0.5335.5)
Pros: Tabbed browsing and integrated RSS support finally added to IE, built-in phishing filter and other security enhancements, better standards compliance
Cons: Preview release lacks finalized feature-set and polish of official release, only available for Windows XP SP2 for now (as well as Windows Vista upon final release), still the most frequent victim of security vulnerabilities in terms of popular browsers
