Hi Steve,

have a look on this sites:

Outlook synchronisation solutions:
http://www.publicshareware.com/outlook-synchronisation-description.php
http://www.slipstick.com/outlook/sync.htm

Office Marketplace Outlook messaging tools:
http://office.microsoft.com/en-us/marketplace/CE010719621033.aspx

In addtion it could be helpfull to "share2 the information and to sync the
items.

Outlook sharing solutions:
http://www.publicshareware.com/public-share-outlook-description.html
http://www.slipstick.com/outlook/share.htm

Article about "sharing your Outlook information (by Eric Legault)"
http://office.microsoft.com/en-us/outlook/HA011477571033.aspx

Maybe it helps.

--
Oliver Vukovics
Share your Outlook PST files without Exchange: Public ShareFolder
Synchronisation for Outlook and Exchange: Public SyncTool
http://www.publicshareware.com