"This meeting is not in the calendar"

[laitkens]

I have a user here who has his delegate set up to receive copies of his
meeting requests. Today the delegate received a copy of his meeting request
and noticed along the top of the request in the grey shaded box it states a
message "This meeting is in the calendar, it may have been moved or deleted".
However, when the delegate checks the users calendar, the meeting is in fact
located on the users calendar and the user has accepted the request.

Can someone tell me why this message appears?

Thank you in advance for any help re: this.