Contact List Sharing without Exchange

Using Outlook 2000 in a peer to peer network without Exchange. Is there anyway to share the contact list besides using Net Folders. If we decide to return Outlook 2000 is there another app that would work for sharing contact lists without using a server. Lotus Notes?? Never used it, but not sure if it would cost us a fortune or be in the same position.

Are there any 3rd party tools that work by sharing the contact list etc…

Thanks