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Early Windows NT Era (1993–1996)
Windows NT 3.1 Advanced Server (1993): Introduced Microsoft's first 32-bit enterprise server architecture.
Windows NT 3.5 & 3.51 (1994–1995): Added early cross-network file-sharing capabilities with Unix systems.
Windows NT 4.0 Server (1996): Brought the classic Windows 95 interface to business networking.
Branded Major Releases (2000–2012)
Windows 2000 Server (2000): Debuted core identity tools like Active Directory.
Windows Server 2003 & 2003 R2 (2003–2006): Enhanced security framework defaults and IIS web architecture.
Windows Server 2008 & 2008 R2 (2008–2009): Introduced Hyper-V virtualization and Server Core deployment options.
Windows Server 2012 & 2012 R2 (2012–2013): Revolutionized cloud integration, storage spaces, and virtual networking.
Modern LTSC and Annual Releases (2016–Present)
Windows Server 2016 (2016): Added container support and Nano Server capabilities.
Windows Server 2019 (2018): Integrated Windows Admin Center and hybrid cloud features.
Windows Server 2022 (2021): Secured core functions with secured-core hardware and TLS 1.3 encryption.
Windows Server 2025 (2024): Latest major LTSC release featuring upgraded Active Directory limits, hot-patching improvements, and modern storage performance.