Comment 576 for bug 532633

I've watched a screencast (long time ago sorry don't want to google it up) from the guy who lead the design team behind Office 2007 ribbon design. He showed a lot of data gathered from the Office 2003 "User participation improvement programme", eye tracking and user test labs.

On particular aspect that applies to this situation was an example from Outlook. The spreadsheet from a small subset (1 month of User submissions) numbers were in about 200 000 range that Outlook users click the toolbar button "detele" 7 times more often then the toolbar button "send" (the data specifically was separating context menus, right click menus and shortcuts).

So if we intrepolate "delete" -> "close window". And "send" -> "send to taskbar / fullscreen" =)))))))) close is a winner ;-)