Excel 2007: How do I horizontally scroll with mouse scroll wheel?

In Excel 2003, you could use the side-to-side function on your mouse’s scroll wheel to scroll horizontally, but for some reason I can’t do it on Excel 2007. Anyone know if there’s a fix for this?

I don’t know if you can; might be easier to click the scroll wheel and just move the mouse horizontally.

The horizontal scroll on my mouse (Logitech wireless) works in Excel 2007.