When I try to save my 03 Workbook in the 07 file format I get the following
error:

Workbook contains one or more of the following features that are not
supported by the selected file format:

Script objects

My workbook contains pivot tables and charts - I don't know if this is the
cause?

I need to convert the Workbook to 07 because I have over 70,000 rows of data.

Thanks!