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BeOS is a discontinued operating system. It was developed to run on the BeBox hardware, a PowerPC based machine. First version was released in 1995-10 for use on the AT&T Hobbit, and later moved over to the PowerPC platform the next year. A Intel x86 port of the OS began in 1998-03 with version R3. The last version released was R5.1 in 2001-11 for x86 only. It was meant to be used for multimedia applications. It is POSIX compatible but is not a UNIX derived operating system (Windows is actually POSIX complient also).