Microsoft Corp. will offer free or discounted Windows 7 upgrades to users who buy Vista PCs after July 1, according to a Web site that has accurately predicted the company's moves in the past.

TechARP.com, a Malaysian Web site that correctly named the release-to-manufacturing (RTM) dates for several Windows editions last year, said that Microsoft will unveil a program for Windows 7 that is similar to Vista Express Upgrade, a 2006 marketing effort that provided free or discounted Vista license to buyers of Windows XP in the months leading up to Vista's early 2007 release.

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