On most Windows PCs and other operating systems, like Solaris, Linux, and other UNIX varients, by default the scroll wheel on a mouse operates the way Mac OS X used to, where the motion of the scroll wheel controls the motion of the scroll bar rather than the page (e.g. scrolling the wheel up moves the scroll bar up, moving the page down.)
The new motion is based on what you do in iOS, where you scroll down by dragging the page down, and Apple is trying to get you to operate the scroll wheel or trackpad as if you were dragging the document on a touch screen like the iPhone or iPad.
When you installed lion and updated successfully but Magic Mouse is scrolling backwards - up goes down and down goes up. Here, it’s solution:
The new motion is based on what you do in iOS, where you scroll down by dragging the page down, and Apple is trying to get you to operate the scroll wheel or trackpad as if you were dragging the document on a touch screen like the iPhone or iPad.
When you installed lion and updated successfully but Magic Mouse is scrolling backwards - up goes down and down goes up. Here, it’s solution:
Just go into system preferences, click on mouse, click on "Point and Click" then uncheck "Scroll Direction". Mine now works in a more intuitive up down direction!source: Apple Support Communities
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