Windows Small Business Server 2000 
(codenamed Windows Small Business Server 5.0) is a closed-source, proprietary server operating system developed by Microsoft, tailored to provide a localized network infrastructure hub for small companies. Built upon the Windows NT hybrid kernel architecture, it aggregates core server roles including local directory services, collaborative portals, and internal communication handling over a specialized Windows 2000 Server software baseline. The operating system reached general availability on February 21, 2001, serving as the direct technological successor to BackOffice Small Business Server 4.5. SBS 2000 marks a major rebranding phase for the product line, dropping the BackOffice moniker in favor of direct alignment with the core NT 5.0 ecosystem. Mainstream platform lifecycle support concluded on June 30, 2005, and all extended security servicing terminated on July 13, 2010.
Development History
Development on the platform, codenamed Windows Small Business Server "5.0", focused heavily on migrating the integrated suite away from legacy NT 4.0 structures and implementing Active Directory services natively for small networks. An early evaluation preview, designated as Build 2128.1.ntoskrnl.000412-1900, was compiled in April 2000 to test the migration of integrated service dashboards onto the new management architecture. The final baseline operating system code base arrived synchronized with the Windows 2000 Server release branches under version 5.0.2195, finalizing its master production compilation state as Build 2195.1.ntoskrnl.001127-1400 on November 27, 2000, before commercial retail packaging routines commenced early the following year.
Features
Unlike traditional multi-tier server suites, Windows Small Business Server 2000 integrates distinct collaboration and internal routing packages directly into unified entry points.
Personal Consoles
To accommodate office environments lacking a dedicated system administrator, the operating system deploys a task-oriented management wrapper over the Microsoft Management Console layout. This interface simplifies routine network management operations such as adding employee login accounts, adjusting shared folder security access permissions, tracking local storage consumption, and managing shared local printers.
Communications Integration
The suite incorporates preconfigured local deployments of Microsoft Exchange 2000 Server and SharePoint Portal Server 2001. This provides small offices with an automated localized company intranet portal, shared file repositories, and a sovereign email infrastructure running natively on the core server hardware without requiring standalone product setups.
An integrated deployment of Microsoft Internet Security and Acceleration Server 2000 provides local networks with managed internet distribution. The utility includes firewall security, web caching mechanisms, and dial-up routing configurations to allow multiple local workstation machines to share a single external network connection safely. == Editions == The platform was distributed as a single comprehensive operations bundle, though client workstation connection limits applied based on corporate licensing scale needs:
| Exchange Mail Server | - | SharePoint Collaboration | Included (SharePoint Portal 2001) |
| Security Proxy Service | Included (ISA Server 2000) | |
| Database Component | Included (SQL Server 2000 Standard) |
See also
Windows 2000 Windows Small Business Server 2003 Microsoft Exchange Server