By Default an excel document is stored with .xls file name extension. Microsoft also has other formats for storing spreadsheet data one of which is the .csv (comma delimited)
To save your excel sheet contacts in excel format, open your excel document with Microsoft Excel open the File menu and navigate to ‘Save As’. The save as dialogue box will appear.
Enter the filename in the relevant field and select CSV (Comma Delimited) in the file type field.
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