Add this to the registry:
[HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\12.0\Outlook\Preferences]
"SendPersonalCategories"=dword:00000001

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Best regards
Michael Bauer - MVP Outlook
Use Outlook Categories? This is Your Tool:
<http://www.vboffice.net/product.html?id=2006063&cmd=detail&lang=en&pub=6>
Am Mon, 3 Mar 2008 04:01:00 -0800 schrieb gembrook:
> I include categories with meeting requests I send, which used to work in
> 2003. In 2007 it apears that the categories are stripped when sending. There
> is a brief note in Microsoft WC042507.ppt that Administrators can enable send
> and receive categories by using policies. But I am unable to find more
> information how to do so.