Take a look here, it may help:
http://www.slipstick.com/outlook/share.htm

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Milly Staples [MVP - Outlook]
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After furious head scratching, Bob asked:
| I have 6 computers running Outlook 2000 or better and would like a
| solution to having a separate Global contact list while being able to
| keep the individual contact list for each user. Has anyone found a
| 3rd party solution to do this?
|
| Thanks. B