Message from discussion CRM Error in Outlook

Thread-Topic: CRM Error in Outlook
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From: =?Utf-8?B?U2NvdXQ=?= <Sc...@discussions.microsoft.com>
Subject: CRM Error in Outlook
Date: Thu, 9 Aug 2007 14:36:00 -0700
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When one of our users, while in Outlook attempts to sellect track in CRM, he 
receives the following error.

"An error occured promoting this item to Microsoft CRM.  The CRM server 
could not be contacted or the user has insufficient permissions to perform 
the actions."

I then altered his permissions to ensure this was not the issue, he now gets 
this error message.

"The user authentication passed to the platform is not valid."

Can anyone help, this user is suddenly unable to attach emails to contacts 
or accounts.