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ArcaOS 5.1 represents the most significant update to the OS/2 ecosystem in over a decade. Codenamed "Blue Lion," it serves as the modern successor to IBM's OS/2 Warp, bridging the gap between legacy reliability and contemporary hardware.

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ArcaOS 5.1 is a commercial OS/2-derived operating system focused on stability, legacy application support (especially for OS/2 and DOS programs), and long-term maintenance for specialized environments. It continues OS/2’s strengths: efficient resource use, robust multitasking, and native support for many older business applications. ArcaOS 5

It includes a proprietary 64-bit UEFI loader, allowing it to boot on modern UEFI-only systems without needing a Compatibility Support Module (CSM) GPT Partitioning: Unlike older versions limited to MBR, 5.1 supports GPT-based disk layouts This is the oldest OS/2 and ArcaOS fan site