In addition to the version history at
http://www.j-walk.com/ss/excel/index.htm, you might find the following
links helpful - I think both are as of May 2004 ... be nice to find
something more current ... but may help get a perspective on how many
users are using each version.

http://pubs.logicalexpressions.com/P...cle.asp?ID=384

http://www.fontstuff.com/comment/comment03.htm#survey2

HTH,

Jeff