Many small businesses have relied on Microsoft's Small Business Server (SBS) family of servers to get their feet wet with their first server and network. Introduced back in 1997 as BackOffice Small Business Server 4.0, SBS has matured into a tightly integrated platform of the most important services a small company needs: file and printer functions, email, calendar and contact sharing, and document collaboration. While it is limited in the maximum number of concurrent user connections, SBS doesn't shirk core services, providing enterprise-grade features at a price point almost every small business can afford.