CSV file including all the fields (blank or not) Outlook will need - will work fine for Outlook 2010, Outlook 2007, and Outlook 2003.CSV file for Thunderbird, SeaMonkey Mail, or Netscape Mail.VCF file..VCF files" will generate one "vCard" file per contact, and export a single zip download containing them all. Tip: in doubt, use the Microsoft Outlook format: as one of the most popular email program, its CSV format will likely work for all webmail providers and/or desktop email clients.
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