The key exists only if the user has modified the default master category
list. It applies to all Outlook configurations.

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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
>I have a client with outlook 2003 running from exchange server 2003, and i
> wish to ensure i backup their contact categories.
>
> I found a document that says to export a reg key but the categories key it
> refers to does not exist. The document does not mention whether this is
> exchange or stand alone.