How to prevent access to public folders?

Hello,

Our active directory is on a Windows 2000 server. We also have Exchange 2003

running on the same box as the active directory. I have set up a user on the

network with an Exchange mailbox. The user is a member of the Domain Users

group. Users access their email from the desktop or via Outlook Web Access.

All of our email users can access our public contacts information via their

mailbox. Is it possible to prevent a specific user from accessing the public

contacts information via their mailbox through Outlook Web Access?

Thank you for your help.