How to create Shared Contacts in Outlook 2003

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I have a group of 10 users who each have contacts in Outlook 2003. As these people work as a group I need to come up with a solution that will enable them to share their contacts. Is there a way to set up one contacts pst and share it, so when the users add contacts or look up contacts they will be using the same file? Is this possible in Outlook 2003? And if possible I would like to limit the sharing of this pst to this group only. Any suggestions would be appreciated. Thanks.