Ubuntu Servers :: Server Share Accessible From Both, Windows An Mac, Readable And Writeable?

We have about four workstations and a server. What we need is authenticating with the server, and when you log on, you should see your own desktip and documents idnependent on which workstation you use. Could this be solved by placing the user's home on a server share?We also need a server share accessible from both Linux, Windows an Mac, readable and writeable, as some prefers to bring their laptops to the office.I've read a little bit about terminal servers, but using the workstations as thin clients sounds like a waste, as they're just as powerful as the server. "Fat" clients sounds better,