Everyone (125 users) in our organization uses Outlook 2003 SP2 running in cached mode with Exchange Server 2003 SP2.
Occasionally someone will send an appointment request to a several people and the sender will get back a Undeliverable: NDR report concerning an email recipient who has been deleted from Active Directory for several months.
Here is a sample:
From: System Administrator
Sent: Monday, April 10, 2006 11:05 AM
To: Heather McMeans
Subject: Undeliverable: Meeting to discuss VBS video.
Your message did not reach some or all of the intended recipients.
Subject: Meeting to discuss VBS video.
Sent: 4/10/2006 11:05 AM
The following recipient(s) could not be reached:
Heather McMeans on 4/10/2006 11:05 AM
The e-mail account does not exist at the organization this message was sent to. Check the e-mail address, or contact the recipient directly to find out the correct address.
This person was not a recipient and their information does not exist anywhere in Active Directory. I think it may have something to do with this person formerly being a delegate of one of the recipients of the meeting request.