Sun has started to distribute free copies of Solaris 10 from its main website in a bid to boost its flagship operating system against Windows and Linux rivals.
John Loiacono, Sun executive vice-president for software, said, "Coming on the heels of Sun's OpenSolaris announcement last week, the free availability of Solaris 10 is the latest in a series of milestones for Sun."
Last week, the company launched the opensolaris.org website to distribute parts of the Solaris source code to developers.
Use of Solaris 10 downloaded from the main website is free, with the company also offering free security updates, but users needing bug fixes and general support will have to take out a support contract.
Sun said its Solaris support offerings were up to 40% cheaper than those offered by "leading" Linux distributors, which it did not name.
Customers can choose basic, standard or premium service plans for Solaris 10, each with scalable and predictable pricing based on the number of processor sockets.
More information about the Solaris 10 services portfolio is available at