Advanced Find is the feature that Outlook provides to search across multiple folders. You can also do it with the free LookOut tool that you can download from Microsoft.

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Sue Mosher, Outlook MVP
Author of
Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
> It would be quite handy to have outlook search either the regular contact
> file or the business contact files as well as identify the location of the
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>
> http://www.microsoft.com/office/community/en-us/default.mspx?mid=b8b9d109-f994-4
06e-b2c4-c7cb3b745f73&dg=microsoft.public.outlook.contacts