The versions of Excel 97 through 2003 all use the same internal file format,
so files may be freely created/shared/opened/saved between versions. Of
course, if you use a tool in XL2003 that didn't exist in 2002, you won't
have it but you shouldn't have problems.
--
Cordially,
Chip Pearson
Microsoft Most Valuable Professional
Excel Product Group
Pearson Software Consulting, LLC
www.cpearson.com
(email on web site)