User showing tentatively booked when not
 

Hello,

We have a Exchange 2003 environment. I have a client who's calendar is
showing tentatively booked for next several months. When you look at her
calendar, everything appears to be normal, but when someone goes to book the
meeting, it shows that she's tentatively booked for next 4 published months.

Is there a setting that she might have clicked on that published her
tentatively booked?