Sharing Calenders without an Exchange se

I am working with a small business who wants to be able to share their Outlook 98 Calendars and Tasks without the expense and administration overhead of an Exchange server. Is there a way to share either Calendars and Tasks, or even private folderswithout using an Exchange server? The site has a small LAN (6 PC’s) and and a 40 GB Snap! file server. They all have a shared network drive, but I just can’t seem to figure out how to share the Outlook information.