Forcing meeting responses in Outlook 2003

Does anyone know if there is a way to force users to send a response to meeting requests they receive in Outlook 2003?  By default there are three options, Edit the response, Send the response now, and Don't send a response.  We have issues with people not responding and some users complain they cannot keep track.
I have the Outlook 2003 ADM template and need some assistance finding the option, or indeed if this is something registry based, i would appreciate any pointers.  I have attached a screenshot of the window in question.
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This should help

Below is an excerpt copied from the above link.

This article describes an Outlook 2003 hotfix that resolves this issue by disabling the Don't send a response option in responses to forwarded meeting requests. To enable this hotfix after you install it, add the ForceMtgForwardResponse registry entry, and then set the registry entry to 1. After the hotfix is installed, a user who receives a meeting request that was forwarded by another user must respond to the meeting request. The Don't send a response option is unavailable. This hotfix must be installed on the computer of the user who forwards the meeting request and on the computer of the user who receives the forwarded meeting request


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