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How to convert a file to CSV?
Clean your mailing list?
Converting to CSV
From Excel to Open Office Calc
Open your file in Excel or Open Office Calc
File -> Save As
In the "File Format" menu, select "CSV (Windows) (separator: semicolon) (.csv)"
From Google Sheets
Open your file in Google Sheets
File -> Download As
Select "Comma-separated values (.csv, current sheet)"
If you have more than one sheet, repeat the same operation.
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