Excel 97 and Excel 2003

I have an XLS that was created back when Excel 97 was in its hay-day. It has tons of macros on the back end doing all kinds of formatting. I didnt author the macros.

My problem: The cells seem to be bigger now causing the data to pour over onto the next page.

Does anyone know why Excel 2003 would interpret the cell size differently than Excel 97?

Thank you.