Question : allow "Big Grid" in Excel

Hi. How can I allow the maximum number of columns and rows in 2007? There is some setting that has to be changed to allow this but I don't know where it is or what it is called.
Thank you.

Answer : allow "Big Grid" in Excel

You need to save your workbooks in one of the new 2007 formats and then re-open them otherwise you will still be limited to the old number of rows and columns.
Regards,
Rory