Sun Microsystems has turned up the volume in its long-running battle with Microsoft over Java.

In full-page ads in The New York Times, San Jose Mercury News and The Wall Street Journal on Thursday, Sun called on consumers to demand that Microsoft include the Java platform in their XP operating system. Sun also said consumers should demand PC vendors like Dell, Compaq, Gateway, IBM and HP (Hewlett-Packard) include the Java platform in their applications.

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