Unix is more stable and does not go down as often as Windows does therefore requires less administration and maintenance. Unix has greater built-in security and permissions features than Windows. it is more stable and it does not crash as much as much as WindowsIt is a stable multi-user multi-tasking system for servers desktops and laptops.
Kernel Stability: Both the UNIX kernel and the design techniques it encourages are renowned for stability. A system of several thousand servers must run reliably and without intervention to restart failed systems
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