Currently Being ModeratedFeb 2, 2013 1:29 AM (in response to EiffelITDept)
The 'server' Contacts and Calendars services in OS X server don't work the way you would expect — like the functionality you would see on a server app like Microsoft Exchange. That is that various users can have shared resources and/or you have server owned resources that you then make available to users/groups with individual, fine-grained permissions.
You can have 'shared' server Contacts & Calendars in OS X Server but what you have to do is setup a (dedicated) user account on which you then create various calendars and address book(s). Then in the Calendar & Contacts apps on OS X and iOS you make accounts on the clients and use that pseudo account on the server as the account — not each individual users' account on the server. So each (real) user 'shares' the pseudo user's account with, obviously, full read-write access.
It ain't beautiful... but it works.