At first glance, this bug - the fact that you can push Internet Explorer so far to the side of the screen that you can't retrieve it - seems like something that should have been fixed right off. Heck, there's even a page that explains how to recover from it at Microsoft's site. 
I'd guess that this falls into that nether region of "ya know, we should fix that" bugs. It's the sort of thing that's annoying to people who run into it, but never quite rises to the top of the bug parade for the internal developers. Every product has annoyances like that - there are scads of bugs listed in our bug tracking system for Cincom Smalltalk that fall into that category. 
The nasty thing is that these sorts of bugs linger, wasting the time of the hapless few who run smack into them - my wife lost an hour to the IE one yesterday, while she was trying to make room on her screen as she sorted through photos. So yes, I could deliver a fine rant about how it's a dumb bug, and how it shouldn't exist - but there's this beam in my eye, see...
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product management