This is a Excellent Application on Learning Apples OSX Server the most powerful server software based on Unix.
Includes Video Training Course.
Learn to get the most out of your OSX Server
Thanks to the legendary simplicity and power of the Mac, a server isn’t just for big companies with large IT departments and huge budgets. Small studios, retail shops, even home-based businesses can all benefit. With OS X Server, you can make it easier for your employees to collaborate on projects and share files, automatically back up important data, host your own website and mail servers, and much more.