If you had Outlook 2000, Microsoft provides a feature called Net Folders that transfers information among a group of people with special e-mail messages; this feature is more stable in Outlook 2000, but still not 100% reliable. However, this feature doesn't exist at all in Outlook 2002.
Maybe?
Share Outlook data over a local network using a data store based on an Outlook .pst file. For Outlook 2003, supports the expanded Unicode .pst store. Not compatible with Outlook 98 or 2000 in Internet Mail Only mode.
http://www.outlookstore.com/
If you don't have too many contacts to share, you can simply send vCard files. This is especially useful if not everyone is using Outlook, since many other products support the vCard standard.
Exchange Server
Microsoft designed Exchange Server specifically for sharing calendar, contact and other information, as well as e-mail. Then you could share with Exchange Server Public and Mailbox Folders.
One way for small organizations to share information without installing Exchange Server in-house is to buy space on a server shared with other companies. We've seen prices as low as $10/month per user. You need Internet access, of course, to get to the server. You should also be able to get browser-based access to your mail, as well as access from the Outlook client. Many firms are now offering individual or workgroup accounts on shared Exchange Servers. Mainly ASP.
Sorry I am not more help on this.