What file formats can the import wizards handle?

You can import contacts and business accounts directly from an ACT! or Outlook file, or from any CSV (comma-separated values) file, such as a GoldMine or Excel file. You can import leads, solutions, custom objects, or person accounts from any CSV file.

Note If commas aren’t appropriate for your locale, use a tab or other delimiter. Specify your delimiter in Data Loader Settings (Settings | Settings).