MicrosoftSmallBusinessServer (SBS) is a suite of tools from MS aimed at the small business. In a recent interview there were comments made where a senior MS manager concurred with the assertion that products such as MicrosoftSmallBusinessServer serve to solidify the company's lead in markets targeted by the LampPlatform.
I take it to mean the package hit the sweetspot in the balance act between costs, functionality, manageability, etc.
Different versions are available, see more at http://www.microsoft.com/windowsserver2003/sbs/evaluation/features/default.mspx
Resources
Aug05 MS establishes a "Small Business Specialist Community", and member firms with this designation (includes the privilege to use a special logo) had to pass Microsoft's Small Business Sales and Marketing Skills Assessment, designed to test the company's knowledge of the dynamics and dependencies of the small-business market, as well as the value to small business of several software solutions. See http://www.wisbusiness.com/index.iml?Article=42594
Jul05 MS targeted medium size companies with special pricing package. See http://www.informationweek.com/story/showArticle.jhtml?articleID=165700420&tid=5979
References
Doing backups on WindowsTwoThousand version of SBS , with ActiveDirectory considerations.
Code named Cougar, WindowsVista based version of SBS server is expected mid 2007, with Centro version coming out that will have Exchange 2007. from http://www.informationweek.com/windows/showArticle.jhtml?articleID=190301936