Scheduling Meetings

[Jamo]

We have a department that uses a department calendar for scheduling meetings
and appointments. The office manager recently left the company and I'm
trying to figure out what was done. Anyway, when a meeting is scheduled and
meeting is accepted an email notification is sent to confirm the meeting.
Here is where the problem is. The acceptance email goes to the office
manager that no longer works here and not back to the department account for
the calendar.
Does anyone know how acceptance email address was changed to another email
address so that I might get the acceptance emails going to the right person?
We are running Outlook 2003 and Exchange Server. All machines are Windows
XP SP2.
Since I am terribly confused by all this, I might not have explained it
correctly. I just know that when someone accepts a meeting the response is
going the the former office manager and gets bounced back because the email
account has been removed from Exchange. I just need to change it to
reflect the correct person receives the acceptance responses.
Thanks and have a good day!