Outlook doesn't support importing to a custom fields. You'd have to write custom code or use a third-party application. See http://www.outlookcode.com/d/customimport.htm.

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Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
> How do I export an excell worksheet with contact details and other customized
> fields to outlook? Using the export function looses customized fields - they
> don't appear in outlook.