Categories are profile specific and are not a specific designed to share
with others. However you can address it by creating a form with the
customized categories. Also see the link below
Yes, this can be done with the Custom Maintenance Wizard, by exporting from an existing Outlook installation and importing into the CMW, but that would overwrite any list that the user has already set up -- probably not a good thing. See http://www.slipstick.com/outlook/olcat.htm for more information.
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Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers