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Spreadsheet programs like Microsoft Excel make it easy to create and edit CSV files. Your CSV file should be formatted as a table and must include a header, or first line, that defines the fields in your table. Gmail accepts many common header fields (name, email address, birthday, etc.). If you're updating an existing file, you probably won't need to change your header field names; if you're creating a new file and need some guidance, you can use any of the field names used in the examples below.