As research by Microsoft revealed web users only use 12 of the features in the browser regularly, the software company decided to give IE9 less-cluttered user interface. In-keeping with the look of Microsoft's recent OS, Windows 7, the browser is framed in 'glass' so web users see a page's content first and foremost.
IE9 also makes use of a number of functions first introduced in Windows 7, including the ability to pin sites to the taskbar, tear off a tab - by dragging it away from the browser - and using Windows Aero Snap to view two sites side-by-side.
"We are particularly excited about developer reaction and feedback to IE9 Beta, with 37 million pages views of our Test Drive site and 13,000 pieces of feedback submitted," Microsoft said, adding IE9 is "on track to be our fastest adopted browser ever".
The web browser hit the two million downloads mark just two days after its September 15 launch.
IE9 can be downloaded from Microsoft's site.
See also: 12 things you need to know about IE9