Email bouncing when replying to Calendar appointments

Well here it goes...

We are running Outlook 2003 on VIsta and Exchange 2003. Lately when someone send an appointment from one of our shared calendars and a user and the user accepts the appointment they are getting a bounce back. Please see below:

Your message did not reach some or all of the intended recipients.

      Subject:      Accepted: Bob Ad Mtg
      Sent:      11/6/2007 11:43 AM

The following recipient(s) could not be reached:

      Research Calendar on 11/6/2007 11:43 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.
            < #5.1.1>

I found an article at Microsoft about this error here -->

This article points at Outlook delegates being the issue, but these users claim they never had outlook delegates (and i shouldn't trust users anyway)

Any ideas on what could be the cause of this issue?
Who is Participating?
ChuckDeezelConnect With a Mentor Commented:
Hmm.  Just as a hunch, have your Exchange admin do an Exchange cleanup on the mailbox.  I have seen previously where a deleted user/mailbox had still existed in somewhere in limbo and only when you replied to a certain DL or resource it would bounce back.  This is simply a wild hunch and Im sure many Exchange guru's are probably cringing at my reply.
Marc_JohnsonAuthor Commented:
Well I just deleted someones account in AD so I had to run the cleanup agent anyway so that I could purge the Mailbox. I emailed the user having the issue but I'm not sure that this fixed it or not? Any other ideas until he tests this and calls me back?
Marc_JohnsonAuthor Commented:
Thanks man that seemed to work :)
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