There are two sets of field names used by Outlook for standard fields – internal names and Display Names (used by the Field Chooser during custom form design and shown in the All Fields List when displaying detailed contact information).
The Display Names are based on the Microsoft Office language setting in use and change accordingly whereas the internal names always remain consistent. When information is exported from Outlook via the Outlook export wizard, the internal field names are used.
There are some fields that are not directly obvious between the two sets such as <Notes> which is internally referred to as the <Body> field.
Another group of fields which are not directly obvious are those related to the Mailing Address. For example, the MailingAddressCity is simply referred to as City whereas the equivalent field for the Business Address group is <Business Address City> (display name) and <BusinessAddressCity> (internal name).
A complete cross reference (in 9 languages) between Outlook internal and display names is available at https://www.contactgenie.com/outlook_fields.htm
All ContactGenie products provide the option to view (and export) Outlook fields using the internal Outlook names or the Display Names in any of the supported 9 languages regardless of the language setting being used.