networed calendar

Alright people lets put our heads together and see if we can help rob out of this little problem.

I have a total of 5 computers that are used as workstations at work, they all have access to our file server, prints and the internet. What we need to do is have a calendar with events like "colnago shipment, monday march 17th" and so forth. Sorta like what you would see in Outlook Caledar.

Now other then setting up a server to run the outlook database file is there any other program I can use that allows many users to share the same database file or all see the same calendar? Do you follow me? When someone adds something to a given date I need it to show up on everyone's calendar.

Any ideas? My head hurts from working on this....

thanks
rob