One of the most noticeable changes in OS X Lion is Apple’s reversal of traditional page scrolling. In Lion, Apple has adopted an iOS approach to scrolling by changing the way that the user scrolls up and down; instead of moving the window around the content, you actually move the content itself.
This method of scrolling works great when you’re on a touchscreen device like an iPhone or iPad, but a more traditional desktop experience doesn’t lend itself to what Apple calls “Natural Scrolling” in Lion.
If you’d like to go back to the old way of scrolling in Lion, here’s how to do so.