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Issues with Calendar Events accepted on iPhone not showing up in users Entourage calendar

macsparks used Ask the Experts™
Users who accept an appointment on their iPhones and who are using Entourage do not see the accepted calendar event on their Entourage calendar. OWA shows it as well as Outlook and Mail.app where appropriate. Using Exchange 2007.
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Top Expert 2010
Please check this

use Outlook Web Access Premium to change a setting: By default, the option for "Automatically process requests and responses from external senders" is disabled. Activate this setting to allow meeting attendee's to properly show as having accepted a meeting proposal.

To activate the "Automatically process requests and responses from external senders" setting, log in to Outlook Web Access (with the affected Exchange account) using a web browser and navigate to Options, followed by Calendar Options.
Awarded 2009
Top Expert 2010

This question has been classified as abandoned and is being closed as part of the Cleanup Program.  See my comment at the end of the question for more details.