I made a survey in Excel 2007 with macros that will unhide rows based on the
value of another cell. I saved it first with .xlsm extension, and when a
user opened it in Excel 2003, it was read only. I then saved it with .xls
and the user was never promted to enable macros when they opened it, but,
after some digging, was able to enable macros and use the form.

This survey is going to non-technical people who won't know how to dig
around to enable their macros. It has to be obvious. Is there a way for
someone with Excel 2000 or 2003 to easily open and use this document? I
don't have a way to test it myself in 2003, so I'm just relying on what my
test users in remote places are telling me.