I have a logitech mouse with previous/next buttons on the thumb side. They behave intuitively in all other applications: shift to previous/next worksheet in excel, go to previous/next page in web browser, etc.

Except in Powerpoint. They behave - or Powerpoint makes them behave - in the unintuitive way. The previous button takes you to the next slide, and next button to previous slide. This is really annoying.

Does anyone know how to fix this?