On September 4, 1991, Sun announced that it would replace its existing BSD-derived Unix, SunOS 4, with one based on SVR4. This became Unix System V Release 4 (SVR4). In 1987, AT&T Corporation and Sun announced that they were collaborating on a project to merge the most popular Unix variants on the market at that time: Berkeley Software Distribution, UNIX System V, and Xenix. 5.3 Post-Sun closed source (March 2010 to present).5.1 Traditional operating system license (1982 to 2004).

Solaris is developed under a proprietary development model, and only the source for open-source components of Solaris 11 is available for download from Oracle. Through the Oracle Technology Network (OTN), industry partners can gain access to the in-development Solaris source code. In 2011, the Solaris 11 kernel source code leaked.

Following that, OpenSolaris was forked as illumos and is alive through several illumos distributions. In August 2010, Oracle discontinued providing public updates to the source code of the Solaris kernel, effectively turning Solaris 11 back into a closed source proprietary operating system. After the acquisition of Sun Microsystems in January 2010, Oracle decided to discontinue the OpenSolaris distribution and the development model. With OpenSolaris, Sun wanted to build a developer and user community around the software. In June 2005, Sun Microsystems released most of the codebase under the CDDL license, and founded the OpenSolaris open-source project. Historically, Solaris was developed as proprietary software. In September 2017, Oracle laid off most of the Solaris teams. Solaris is no longer actively developed or released. Solaris was registered as compliant with the Single UNIX Specification until 29 April 2019. Solaris supports SPARC and x86-64 workstations and servers from Oracle and other vendors. Solaris superseded the company's earlier SunOS in 1993, and became known for its scalability, especially on SPARC systems, and for originating many innovative features such as DTrace, ZFS and Time Slider. After the Sun acquisition by Oracle in 2010, it was renamed Oracle Solaris. Solaris is a proprietary Unix operating system originally developed by Sun Microsystems. Monolithic with dynamically loadable modules Sun Microsystems ( acquired by Oracle Corporation in 2010)ġ1.4 / August 28, 2018 4 years ago ( ) Screenshot of Java Desktop System on Solaris 10

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