In a move aimed squarely at Microsoft Corp., Sun Microsystems Inc. on Tuesday will unveil a suite of software for businesses that want to dump – or just can't afford – the Windows operating system on their companies' desktop computers.

The Sun Java Desktop system, which was formerly code-named Mad Hatter, runs on the open-source Linux operating system and includes a variety of other programs that replace Microsoft's Internet browser, productivity suite and other parts of the Windows package.

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