iCal and Address book

[efoivx]

Does anyone know if their is a way to share and sync 1 iCal and 1 Address book between a group of users?

I DON'T mean the normal subscribe to an iCal.

I suppose what I am looking for is something that works along the lines of MS Exchange / Outlook

I shared adress book and a calendar we can all post to....

Any iDeas?

Thanks in advance