Outlook 2000

Hi,

I am having very annoying problem at my work place.
One of my colleagues has obtained access to everyone’s Outlook Inbox (i am not sure about other folders). I have seen all these folders in her Outlook. It’s just like you have a folder in your Outlook but it contains items from other user’s Outlook. I was worried about this and I asked her to which she replied that it’s for support purposes. However, I am also in IT and I don’t need support for my Outlook so I requested mine to be removed. I am not sure, however, if this might not recur. Is it possible for me to prevent this technically?
Regards,