I think that's why they have to kill it. That dependency is holding IE back, and keeping it unpopular in the market. Every time IE met a specification milestone, it broke Microsoft Dynamics CRM--my product specialty. Over the last 4 years alone, Dynamics CRM has grown to support many other popular browsers; owing in part, to the inevitability of IE's need to mature. Office may never find the inspiration to break its dependency without being forced out of that comfort zone. I believe this is intra-departmental tough love at Microsoft HQ, and a chance for Microsoft to finally introduce us to a web browser that meets (or exceeds) the high standards set by the industry.