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Vote for TeamContacts for Outlook
Until now it was almost impossible to get a good overview of your co-worker contacts in one global address list integrated with Outlook ® (without Exchange). TeamContacts is an easy to install Outlook ® add-on, which solves that problem effectively and flexibly.
You can filter the contacts you want to share (and take with you on your PDA) by using categories. All of these features are available on network, LAN or even a peer to peer network. No server software is required but it works great with Exchange server public Folders.