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Are you referring to Excel spreadsheets or Google Spreadsheets?
For Excel, you can download all the submissions data into an excel file in the submissions page.
Here's a guide: http://www.jotform.com/help/44-How-to-Export-Form-Data-to-Excel
For Google, you need to use the Google Spreadsheets Integration.
Hope this helps. Let us know if you need any assistance.