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Solaris is a Computer Operating System developed by Sun Microsystems . It is Certified as a version of UNIX ; although Solaris proper is still Proprietary Software , many core components have made their way into an Open Source CDDL version, OpenSolaris . During the 1980s, Sun's version of UNIX, SunOS , was based on BSD UNIX. In the early 1990s, Sun replaced SunOS 4 with a version of UNIX System V Release 4 , jointly developed with AT&T . This was marked by changing the marketing name of the operating system to Solaris 2; however, the term "SunOS" was still used to refer to the underlying operating system itself, and Solaris is considered to be the SunOS 5 operating system plus a graphical user environment, ONC+, and networking and other components. The SunOS 5 minor version included in earlier Solaris releases corresponds to the minor Solaris version number. For example, Solaris 2.4 incorporated SunOS 5.4. After Solaris 2.6, Sun dropped the "2." from the name, so SunOS 5.10 forms the core of Solaris 10. Confusingly, around the same time as the launch of Solaris 2, Sun also started labeling the later (SPARC) SunOS 4 releases as Solaris 1. However, this usage of the Solaris name is not common. SUPPORTED ARCHITECTURES Solaris uses a common code base for the architectures it supports: SPARC , X86 and AMD64 . Solaris was also ported to the PowerPC architecture ( PReP platform) for version 2.5.1, but the port was cancelled almost as soon as it was released. Solaris has a reputation for being well-suited to SMP and supporting a large number of CPU s. Sun also plans to implement part of the Linux API s in Solaris 10, allowing Solaris to natively run Linux Binaries on X86 and AMD64 systems. Solaris is tightly integrated with Sun's SPARC hardware, and is designed and marketed as a combined package. This has often led to more reliable systems, but at a cost premium over commodity PC hardware. However, since the availability of commodity 64-bit CPUs (based on the AMD64 architecture), the latest version of Solaris, Solaris 10, has been designed with AMD64 in mind. Sun heavily marketed Solaris on x86 with its AMD64-based entry-level Server s. DESKTOP ENVIRONMENTS The first Solaris Desktop Environment was OpenWindows . It was followed by CDE in Solaris 2.5. Sun's Java Desktop System , which is based on GNOME , is included with Solaris 10. LICENSE Solaris's source code (with a few exceptions) has been released under the CDDL as open-source in the OpenSolaris project. Both binary and source versions are currently downloadable and licensed without cost. Sun's , 2005 , from the current Solaris development code. Future releases of Solaris proper will be derived from OpenSolaris. VERSIONS In descending order, the following versions of Solaris have been released ( As Of Early 2006 ): Solaris 7 and Solaris 2.6 are no longer shipping but still supported. Earlier versions are unsupported. A more comprehensive summary of some Solaris versions is also available. Solaris releases are also described in the [http://www.science.uva.nl/pub/solaris/solaris2/Q1.5.html Solaris 2 FAQ . SEE ALSO
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