How to create global task categories

We use Exchange Server 2003, SP2. Most of client are on Outlook 2003, with a few using Outlook 2007. We are trying to implement a system for people to assign tasks (or make requests) using tasks in Outlook. I have some predefined task categories that I would like people to be able to choose from. When I assign a task to someone I can create a new category, and that person can then see the category, but it does not become an option for them to choose when they create a new task. I would like to be able to create a list of task categories that everyone is able to choose from. Is this possible?
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PMFMAuthor Commented:
No answers...  I'm assuming the category list itself is local to each copy of Outlook. If that's the case, is there maybe a way through GPO to force out new category items?
PMFMAuthor Commented:
Well, I guess no one has an answer. I did find this knowledgebase article from Microsoft that looks like it might solve my problem:

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