Microsoft Readies Windows 10 for Next Month in PC, Tablet Push - Bloomberg Business

Check this Microsoft post for more details

"Microsoft Corp. is preparing Windows 10 for release on July 29, in time for the back-to-school personal-computer season, as the company tries to boost an ailing PC market and revive its own fortunes in mobile devices.
The operating system will be available for PCs and tablets as a free upgrade to people using Windows 7 and Windows 8.1, or on new Windows 10 devices, Microsoft said in a statement Monday. Windows 10 for other devices will be available later this year."

Microsoft Readies Windows 10 for Next Month in PC, Tablet Push - Bloomberg Business