I never use the wheel on my mouse. I don’t have a good reason; I just can’t recall ever using it before. However, I recently discovered that the wheel increases and decreases the screen magnification in Excel. It’s so simple to use:

  1. Hold down the Ctrl key.
  2. Move the wheel forward to zoom in.
  3. Move the wheel backward to zoom out.

While moving the wheel, watch the Zoom control on the Standard toolbar update accordingly.

Moving the wheel forward and backward scrolls the screen.