Microsoft is expected next month to disclose more details on Longhorn, its planned upgrade to Windows, as the company looks to drive demand for the forthcoming operating system.

At its Professional Developers Conference in Los Angeles, the Redmond, Wash., software maker will detail Longhorn's underlying graphics and user interface technology, code-named Avalon. Details on Avalon, a database update code-named Yukon, and a new Web services development framework called Indigo are expected to be the highlights of the conference, according to sources familiar with the company's plans.

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