It is possible to create a situation where someone sending a meeting request will receive a “Message not delivered” response from a user who was not originally invited to the meeting. This is an uncommon message to receive because meeting requests and the use of delegates are relatively uncommon.

Specifically, this occurs when the user sending the meeting request receives a “5.1.1″ non-delivery report from the Exchange Server because a user was deleted from Active Directory and was an email delegate of an original meeting invitee. Exchange stores delegates in the message store instead of in Active Directory, so those references aren’t removed when the delegated user is deleted from Active Directory. Microsoft KB article #312433 describes how to remove an orphaned delegate directly from the Exchange information store - two resolutions are detailed, the second uses Microsoft’s MAPI message store viewer Mdbvu32.exe to edit the message store, Mdbvu32.exe can be downloaded here.

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