Saving in XLSX Format

[bbal20]

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.

 

[Sheeloo]

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))

 

[Jacob Skaria]

If you are using 2003 with the latest service packs, Excel 2007 formats are
listed towards the end. The first one out of this list is .xlsx.

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