Hi Lisa,

with Exchange Server or without?

If without Exchange do you want to share Outlook only on 1 computer?
http://www.slipstick.com/outlook/olshare1.htm

For sharing Outlook without Exchaneg in a network:
On this site is an article on various ways to share Outlook data:
http://office.microsoft.com/en-us/assistance/HA011477571033.aspx

and a list of a list of third-party sharing tools is also on this site:
http://www.slipstick.com/outlook/share.htm