Without Exchange server, your options are limited to one of the solutions
here:
http://www.slipstick.com/outlook/share.htm

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Milly Staples [MVP - Outlook]
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|I would like to set up Outlook 2002 on four computers runing Windows XP and
| one running Windows 98 so the calendar can be shared. Any suggestions?
The 'OpusFlow GroupCalendar for Outlook' might be just what you need.
http://www.OutlookGroupCalendar.com
> I would like to set up Outlook 2002 on four computers runing Windows XP and
> one running Windows 98 so the calendar can be shared. Any suggestions?