Like all per-folder settings, this one is keep in the information store. You can script it with the MAPIFolder.ShowAsOutlookAB property.

Signature
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
> I'm using Outlook 2003 with an Exchange 2003 server (no .pst file) and
> have about 20 contacts subfolders. Whenever I setup Outlook on a new
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>
> Thanks