is it using a custom form?
SP3 blocks some custom forms.
http://www.slipstick.com/outlook/ol2003/ol2003sp3.htm

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"Woodstock" wrote in message
...
I have a problem with an employee's Calendar in Outlook 2003. This is a
very
recent install with SP3. While in Calendar, I'm trying to create a
meeting. I
click on the Actions button then select New Meeting Request. The following
error appears, "The form required to view this message cannot be
displayed.
Contact your administrator."

There is also a second problem I am having. When accepting an email with a
scheduled appointment or meeting, by either clicking calendar or accept,
the
subject line is empty. This employee is the only one having this problem.