Office Button- SAVE AS- Excel Workbook saves in the new XLSX format ( as it
is the default format for 2007)...

You can also click on Office Button- SAVE AS and pick the first entery in
the Save as type box (which is 'Excel Workbook (*.xlsx))

"bbal20" wrote:

I'm having a difficult time trying to figure out how I can save my
spreadsheet to the XLSX format. It is not listed as an option in the drop
down menu "Save as Type". Please advise.
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Thank you for your help and support