The reason that zip doesn't do much with an xlsx file is that your xlsx file
is already a zipped collection of xml files.
To confirm this, try copying your xlsx file, then rename the copy from .xlsx
to .zip, then open the zipped folder and see what's there.
--
David Biddulph


"excelleration" wrote in message
...
My company recently upgraded to office 2007. With excel 2003 I could
zip a 30-35mb file to less than 5mb. The same kinds of files/data in
2007 only zip from 30-35mb to 25-28mb.

Is there a different software that can comprress better? Is there a
setting in Excel 2007 i can change?

thanks