Thanks to all who responded. The first several responses all offered
open office as a substitute (www.openoffice.org
<http://www.openoffice.org/> ). I e-mailed the address to my students,
those who needed it were able to download it and install it. Today, the
Excel-based assignment came in from everyone. Looks great!
Some other spreadsheets were recently recommended. I'll keep them on
file in case we develop a problem with open office. Thanks again.