Windows Server 2025 is Microsoft's latest enterprise server operating system, released in November 2024 and supported through November 2034, building upon the Windows NT kernel foundation that powers modern datacenter and hybrid cloud infrastructure. It introduces transformative capabilities including hotpatching for zero-downtime security updates, native NVMe storage optimization delivering 90% more IOPS, GPU partitioning for AI workloads, and deep Azure Arc integration for unified hybrid management. Unlike previous releases, Server 2025 emphasizes security-by-default with mandatory LDAP channel binding, TLS 1.3, and hardware-accelerated BitLocker—while maintaining full backward compatibility with Active Directory environments dating back to Windows Server 2012 R2 functional levels for seamless enterprise migration.