There is no server 2002, did you mean Server 2003? What version of Exchange are you running? What are you running on the client side -XP Pro or Vista? and what are you using for their email client? Outlook 2002 or 2003 or 2007 etc
Give more to work with.
*** Improved by Wrobinson on 4/19/08 ***
In Outlook and in OWA, public folders are available by default; however, the current view may not show them. To see all folders, including public folders, click on the folder list view.