Wait... I thought the browser wars were over?
IE still represents abut 20% of Browser usage, it's still more than Firefox and a lot more than Safari. You never know, the new direction MS is taking with regards to openness may bear its fruits. It's going to take a lot for MS to regain its past market shares, but personally, I'd prefer if it stayed around and compete with the other browsers. I don't want Chrome to end-up being the new IE.
IE is at ~60% of desktop browsers and sites that report combined numbers for multiple device types sometimes reduce their desktop numbers.