Microsoft has announced “Windows 8.1 with Bing”, a cheaper edition of its Windows operating system for OEMs. This special edition of Windows would have Bing as the default search engine within the Internet Explorer. Although, the users would be able to change their default search engine and even the default web browser, the Windows 8.1 would cost just $15 to the OEMs, whereas the regular Windows 8.1 license costs $50.
Just to remind you, Microsoft has already announced to make Windows Phone 8.1 free for 9-inch or smaller devices.
This is clear that the Microsoft is worried of the increasing popularity of Chromebooks. It is trying its best to attract users and OEMs.