The Solaris x86 operating system from Sun Microsystems had been costing $20 to download. In a new drive to get the software into as many hands as possible Sun has now dropped this charge. The OS is for servers with Intel or Advanced Micro Devices.

"This move will enable Sun's many customers that are unable to place orders in U.S. dollars--for example in Asia and Europe--to download Solaris easily," Sun said.

A Sun statement said: "With the announcement of Sun's alliance with AMD, there is an accelerating global demand for Solaris x86 that can be quickly addressed by improving the download experience for potential customers."