Apple macOS silently removed from official Unix registry

Apple's macOS has been quietly removed from The Open Group's official registry of Unix-certified operating systems. For years, macOS held the status of a registered Unix product, a certification that confirmed compliance with the Single UNIX Specification. While Apple has not issued a formal statement regarding the change, the removal suggests a shift in how the company manages its operating system's compliance status or branding. The Open Group maintains the Unix trademark and certification standards, which are critical for enterprise interoperability. This development has sparked discussion within the developer community regarding the implications for POSIX compliance and the future of macOS as a Unix-based platform. Despite the loss of the official certification, macOS remains built upon Darwin, a Unix-like core, and continues to provide a terminal environment that is highly compatible with traditional Unix utilities and development workflows.