User mailbox shared Calendar undeliverable distribution lists

We have a user account "records" created in Exchange 2003 - we have since migrated to 2007. This account is accessed by 4 other users with owner permissions set through the client properties

When a calendar request is sent to this mailbox the requester gets a mail delivery failure from two addresses that no longer exist in our organisation.

Looking at the failure message - a response is sent to 3 addresses two of which do not exist

Delivery has failed to these recipients or distribution lists:
Anne Wilson
The recipient's e-mail address was not found in the recipient's e-mail system.
Brenda Park....

i dont know where/how this is going to these non-existant people or even the one address that does exist.
It is possible to send an email to the records mailbox no problem only Calendar appointments get the bounce back errors

have checked "delegate access" " Rules Client & Server"   "delivery options under Mail Flow Settings Exchange Management Console".

Where else could this setting be ?
Thanks in advance
- Daniel Thumath
ETGTECHSystems EngineerAsked:
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Simon Butler (Sembee)ConsultantCommented:
Delegates.
Classic delegate issue. You need to login to that mailbox with Outlook where it is the PRIMARY account, as that is the only way that you can see the delegate information. Those users will be listed as delegates on the mailbox.
Using EMC to check isn't enough.

It could also be what I have described here:
http://blog.sembee.co.uk/post/Account-Does-Not-Exist-Error-When-Appointment-Sent-to-Another-User.aspx

Simon.
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ETGTECHSystems EngineerAuthor Commented:
Thanks Simon - had tried the first option of using the primary account.

The option you describe in your blog is the one that worked. Adding a new delegate - waiting then deleting that new delegate.
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