The 1992 releases of SCO UNIX 3.2v4.0 and Open Desktop 2.0 added support for long file names and symbolic links.

It includes support for large files, increased memory, and multi-threaded kernel (light-weight processes).

This merged codebase is referred to as UNIX System V Release 5 (SVR5) and was used only by SCO for OpenServer 6; SVR5 is not used by any other major developer or reseller.

It is widely used in small offices, point of sale (POS) systems, replicated sites, and backoffice database server deployments.

Prominent larger SCO OpenServer customers include McDonald's, Taco Bell, Big O Tires, Pizza Hut, Costco pharmacy, NASDAQ, The Toronto Stock Exchange, Banco do Brasil, many banks in Russia and China, and the railway system of India.

Until Release 6, this came primarily in the compilation system and the UDI driver framework and the USB subsystem written to it.

By the end of the 1990s, there were around 15,000 value-added resellers (VARs) around the world who provided solutions for customers of SCO's Unix systems.

SCO announced on August 2, 2000, that it would sell its Server Software and Services Divisions, as well as UnixWare and OpenServer technologies, to Caldera Systems, Inc.

The "Definitive 2018" releases were a commitment by Xinuos to keep the legacy OS's updated and supported protecting the applications that customers need to continue to run.