Appointments show in two Calendars

[aldz00]

If a user receives an appointment (For himself) it shows in two Calendars,
his Exchange Calendar under his account and also the Organization Calendar.
How does he get it to show in his Calendar only when the appointments are
only sent to him?
We sent a test appointment to HIM, as a test, and he recieves it in the Org
Calendar and His Exhange Calendar.

 

[Brian Tillman]

If a user receives an appointment (For himself) it shows in two
Calendars, his Exchange Calendar under his account and also the
Organization Calendar. How does he get it to show in his Calendar
only when the appointments are only sent to him?
We sent a test appointment to HIM, as a test, and he recieves it in
the Org Calendar and His Exhange Calendar.

If the event shows in two calendars, then it's possible he has some kind of
add-in that's replicating the event into the "org calendar" (whatever that
is). As far as I know, the only calendar that Outlook will use is the
person's default calendar.