You might want to look at the tools listed at
http://www.slipstick.com/config/convaddr.htm, especially Address Magic.

Signature
Sue Mosher, Outlook MVP
Author of
Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
> We have a requirement to place a downloadable file on our company web site
> for employees to download and import into Outlook to create an address
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>
> I cannot beleive that Outlook does not support a way to do this.