After waiting for the mailman to deliver Mac OS X Leopard server I could start installing Leopard Server. And its up and running, I had to overcome some humps and bumps like ejecting the installation cd-rom out of the mac mini. But it finally works, I'm currently busy with studying the `Getting Started Guide` from Apple. And the guide helped me already with some basic setups. So it can only get better.
Just started with the possibilities research, I've read the iCal service administrator guide. Nothing astonishing was mentioned in the documentation, some how I didn't expected that, but what was mentioned was some basic installation operations. All ways handy when your installing the server.