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However, in the first part of the 21st century many of these same legacy system vendors, particularly IBM and Hewlett-Packard, began to adopt Linux as part of their overall sales strategy, with " open source " marketed as trumping " open system ".

Consequently an IBM mainframe with Linux on zSeries is marketed as being more of an open system than commodity computers using closed-source Microsoft Windows — or even those using Unix, despite its open systems heritage.

In response, more companies are opening the source code to their products, with a notable example being Sun Microsystems and their creation of the OpenOffice. org and OpenSolaris projects, based on their formerly closed-source StarOffice and Solaris software products.