What version of Outlook? AFAIK, that is not possible in any version.
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Diane Poremsky [MVP - Outlook]
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http://forums.slipstick.com/showthread.php?t=39473
<(E-Mail Removed)> wrote in message
news:f6e868b8-2d95-4238-a286-(E-Mail Removed)...
> Is there a registry key setting that will disable the ability for
> users to remove category tags once applied to a message? I've located
> the GPO settings which provide a basic facility to customize the
> category properties in Outlook, but I haven't been able to identify
> more granular settings to allow for finer control of the category
> capability.
>
> Thanks in advance for your help -
>