Yes, the organiser is inviting the recipient. The recipient is a delegate of the sender, but the recipient has no delegates - which is why the Outlook message is puzzling her.
Hope you can reproduce the problem.
A user on Outlook 2010 on our Exchange 2010 mail server has received a meeting request from a colleague that says "The meeting request has been sent to your delegate(s). Your delegate has not responded to this meeting.". The user receiving the meeting request does not have any delegates...
Thankyou for the response. We don't use POP3 so that can be discounted in this case. The shared mailbox is accessed as an additional mailbox from Outlook.
If one or more of the users have their Outlook client set to use cached mode could that be the reason?
Is it possible for Outlook to send a Read Receipt more than once? I have a user who has received a Read Receipt a couple of days ago for a message they sent about 10 months ago. The message tracking logs confirm that they received a Read Receipt initially just after they sent the message but...