Windows

Windows is a family of proprietary operating systems developed by Microsoft, first released in 1985 as a graphical extension to MS-DOS. It is the dominant desktop operating system globally, with variants spanning from embedded systems to server platforms.

Windows Server runs enterprise workloads including databases, web services, and directory services. The Windows NT kernel architecture — introduced in 1993 — separates user-mode applications from kernel-mode system services through a hardware abstraction layer and executive services. This design influenced later operating systems and established the model of a portable kernel that could support multiple processor architectures.

In the context of virtualization and cloud computing, Windows presents unique challenges. Unlike Linux, Windows is not open-source and requires licensing fees per virtual machine instance. This makes Windows workloads significantly more expensive to run in Infrastructure as a Service environments. Additionally, Windows has historically been slower to adopt container technologies compared to Linux, though Windows Server Containers and Hyper-V Containers have closed this gap.

Windows represents the last major proprietary operating system in an increasingly open-source world. Its dominance is sustained not by technical superiority but by network effects: the vast ecosystem of Windows applications, the corporate IT infrastructure built around Active Directory, and the user familiarity that makes migration costly. This is not a criticism of Windows as a product; it is a systems observation about lock-in. The question is not whether Windows is good but whether the cost of its monopoly — in licensing fees, security vulnerabilities, and architectural rigidity — is worth the benefit of compatibility. For most enterprises, the answer is still yes. For cloud-native workloads, the answer is increasingly no.