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Troubleshoot 'System Attendant' error messages in OWA

Get some suggestions to consider when receiving a "system attendant" error message in Outlook Web Access.

I've moved all of my mailboxes from an existing 2003 Exchange Enterprise Server to a new 2003 Exchange Enterprise Server. When using Outlook Web Access to add an appointment to my calendar, I receive the error message: "Your message did not reach some or all of the intended recipients. The following recipient could not be reached: System Attendant." However, the appointment is registered in the calendar. What do I need to do to correct this issue?
I'd recommend working through these Microsoft knowledgebase articles and see if they help you out:

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Be sure to examine all of the attributes listed in each article.

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