Hi JR,
It depends mostly on the macros and user forms. Excel's object model had some minor changes over the versions.
But I guess your chances are far above 90%, if you don't use versions older than Excel97.
Look here for a list of some changes:
http://www.j-walk.com/ss/excel/index.htm

Signature
Kind regards,
Niek Otten
Microsoft MVP - Excel
|I have created a file in Excel 2003, and saved as "Excel 97-Excel2003
| &5.0/95 Workbook" and I am running XP.
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| Thanks for the anticipated help.
| JR
jrwheels16@gmail.com - 09 Mar 2008 15:59 GMT
Niek,
Thanks for the info.
JR