InfoWorld reports that Microsoft will offer free Windows 7 upgrades to users who buy Vista PCs after July 1

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's 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.

Report: Microsoft to do free Windows 7 upgrades