Server operating system is a whole new concept and has been upgrading itself every half a year. Especially with the increase in number of businesses across the globe plus the rapid increase of manpower, the network within a group is massive and requires robustness.
Two of the premier server operating systems are the Apple Mac OSX Server Snow Leopard and Microsoft Windows Server 2008 R2. They have been the market leaders over the past couple of years. Apple Mac OS Server is one of the best performing server operating system. The speed is almost double compared to the rivals.
With a 64 bits capability, it is one of the most powerful servers. Mac Operating server also provides an easy to setup process but is quite costly otherwise, which only top notch companies can purchase. On the contrary, Microsoft Windows Server 2009 R2 is quite cheaper and provides superior speed to the users across the whole network.