I have a mac mini server with leopard, macbook pro, imac and iphone 4 i would like to use the server as the host for all mail, contacts, directories, intranet etc i would like all devices to have mail pushed using outlook as the prefered mail client?

can anyone shed some light on how to do this i am currently using the server as a file storage system but feel it can deliver far more; ideally i would like the following;

1. email to push to all devices once sent form one device all devices have a copy of the sent item
2. accounting software that is shared on the server
3. access the files and directories securely form anywhere
4. create and host an intranet site

any ideas of how to setup easily or step by step guides

help would be greatly appreciated

regards

rd