making Outlook Calendars in Public Folders seen in Location field

Trying to support a client whom created a dozen Calendars (email enabled) in Public Folders on Exchange 2003 and they wanted to make them to be able to select in the Location field when making a Appointment and Meeting Request… It makes sense but not sure how! Is this possible? If so, how? Will these changes apply to every other user’s Outllok 2003 too?

Appreciate your helps!