The Windows Server 2008 R2 operating system that underlies Windows Small Business Server is a proven, reliable, and secure operating system with the features to run a business of virtually any size. With SBS 2011, the operating system and server components have been specifically tuned to support from 5 to 75 users in a small business environment, with all the server functions residing on a single computer.
Some of the features that make Windows Server 2008 R2 ideal for a small business server include
Easy installation that is almost fully automated in Windows Small Business Server
A robust yet easy-to-administer security model using Active Directory
The NTFS file system, which fully supports long file names, ...