Apple calls OS X Server ($20) “The Server for everyone.” At such a low cost—and especially compared to the $499 price tag of Snow Leopard Server—it’s a pretty easy purchase. The Mountain Lion add-on is designed to be a really easy, point and click solution; some power users say it’s too simplistic.
But for those running a small business or needing a home server, it’s definitely worth consideration.
OS X Server is made to easily share files, calendars, contacts, messages, and more with multiple users over various devices.
It can also be used to host a website, setup other Macs, iPhones, and iPads, and backup multiple computers using Time Machine. Best of all it looks just like Mountain Lion, so it’s relatively easy to jump in to.