Dear Mary,
have a look on this sites for Outlook sharing solutions (without Exchange):
http://www.mapistore.com/Outlook/Groupware/
http://www.slipstick.com/outlook/share.htm

Signature
Oliver Vukovics
Share your Outlook without Exchange: Public ShareFolder
Notebook Synchronisation for Outlook: Public SyncTool
New Domain: www.publicshareware.com
> Is it possible to see other people's calendars or share calendar
> information
> in some way? We have a small team, are networked but don't have Exchange
> Server.
>
> We also have a mix of 2000, XP and 2003 Outlook versions