Microsoft says Windows 10 to be free upgrade for recent buyers

Microsoft Corp said on Wednesday the upcoming Windows 10 operating system will be offered as a free upgrade to users of the most recent versions of Windows and Windows Phone software. The announcement by Terry Myerson, who runs Microsoft's operating systems group, is a marked change for the company, which has charged for new versions of Windows, one of the main profit drivers. Windows 10, expected on the market this autumn, will be available for one year as a free upgrade to users of Window