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There's market share to be had in including features such as pop-up blocking and tabbed browsing, but whilst web authors continue to write markup around the problems of Internet Explorer, the users aren't going to see any difference between new browsers and old. We can change that by ceasing support for browsers more than a few years old, but at a cost of our own market share.
The next major upgrades will provide only incremental improvements in standards support. Major new technologies will probably be supported, but only on Microsoft's terms -- as it was for HTML, CSS, Vector graphics, PNG and client-side scripting.