POI doesn't work with Excel 97
 

I'm using Jakarta POI to access to a excel
Poi works and updates correctly the values in the cells but if I open the
resulting document with Excel 97, does not update the values of the
formulas

With Excel 2000 it doesn't happen and I must to do that it works with Excel
97. Do you know how I can to fix it?

Anything I read many times he "Excel evaluates the formula when you open
it".
With Excel 97 too?

Thank you and sorry for my english :-)