Press Record.

in this News.com article Steve Vamos, Microsoft Australia's managing director said ""I don't agree that just because a (competing) product has a feature that we don't have, that feature is important," he said. "It is not. It is only important if it is a feature the customer wants. There are plenty of products out there with features we don't have. We have plenty of features that our customers don't use.
"If there are features in our products that are subpar or need to be added, then I have great confidence that we are an organization that responds pretty quickly and effectively to that."

English reiterated that features such as tabbed browsing are not important to IE users.

Now looky here, Microsoft on it's Main Windows Page Spotlights this free plug-in asking visitors "Want Tabbed Browsing, Search Toolbars, and More?"
Even if this featured plug-in does more than tabbed-browsing, I find it ironic that Windows notes those two Firefox standard features on Windows.com.
http://www.windows.com/