I have a user "a" that has shared his calendar with user "b". User a also has Reviewer rights to the calendars of user b and user c. Whenever someone creates a meeting request intended for user a, user b and user c both get copied via email of the meeting request. User c doesn't even have rights to view user a's calendar.
I have checked user a's Outlook 2003 for any strange rules that may be forwarding these emails, and he has no rules. User c has actually left the company, and his mailbox is being monitored by the company executive assistant. She has send on behalf rights for all these user's mailboxes, if that makes any difference. Where could these meeting request copies be originating from? The executive assistant does not want the other users notified any longer of user a's meetings. She says this has been going on for a long time. Let me know if you need any further information. Clients are Outlook 2003, server is Exchange 2003 sp2 running on Windows Server 2003.