Robert McMillan, IDG News Service

Microsoft will release a fully supported version of its Windows Live OneCare software tomorrow, marking the software giant's entry into the security software market.

OneCare will be available for download as of May 31 on Microsoft's Web site, a day earlier than expected. By Thursday, the software is expected to be widely available in U.S. retail stores, said Microsoft's Samantha McManus, a business strategy manager with Windows Live OneCare.

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