From: Brian Tillman [MVP-Outlook] on
"butter" <butter(a)discussions.microsoft.com> wrote in message
news:B5498A93-AA6A-4618-A8E3-53E80E9B4E4C(a)microsoft.com...

>I tried creating a new profile and the first 2 times I opened the calendar
> and tried to create an appointment it worked. The third time I started
> receiving the same message.

Have you tried clearing the form cache?
http://www.howto-outlook.com/downloads/clearformscache.htm
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Brian Tillman [MVP-Outlook]