The company Microsoft unveiled the first public preview version of the mobile Windows 10: It is now available for the first testers. This version of the OS Windows 10which has been specifically designed for devices Windows PhoneARM-powered tablets, as well as tablets Intel.Preview of the operating system is suitable for certain smartphones Windows Phone: their owners can download a test version by registering on the website Microsoftto become an official tester.This version can only be installed on certain devices Windows Phone, particularly on the Lumia 630, 635, 636, 638, 730 and 830. Microsoft they say that the new, lighter browser Microsoftwhich goes by the name of Spartan, for the mobile pre-release version Windows 10 will not, although they showed it briefly to those who attended the event on January 21. Microsoft plans to add Spartan, which will become defolt for computers and mobile devices, in the next preview, which is promised in the coming months.In addition, in the mobile version Windows 10 office applications are available, including Word, Excel, and PowerPoint, as well as an updated version of OneNote. These items will be included at no charge for devices Windows Phone and small tablets Windowswho use a mobile Windows 10Skype/SMS will be built right into the mobile version Windows 10So, what features are included in the test version of the mobile Windows 10Full-screen start-up background image- More convenient and faster Action Center- Interactive notifications- Improved speech recognition- More powerful photo appB Microsoft did not say when exactly the mobile version will be released Windows 10. Rumor has it that a presentation is planned for October, but only time will tell if this is true.