Microsoft announced Windows 10 on Tuesday at an event in San Francisco, marking the next major upgrade to Windows and the return of the Start menu.

Windows 10, which skips a number in its sequential order (many believed it would be called Windows 9), is the first major update since Windows 8, which was considered a failure by many and virtually ignored by businesses. It will also be the name of the next mobile operating system for Windows Phone.

Windows 10

Windows 10 will be available in late 2015.

Although it’s unclear why Microsoft decided to name it Windows 10 instead of Windows 9, perhaps there’s one obvious reason: the company wanted to distance itself as much as possible away from the previous version.

Currently Windows 10 is under development and Microsoft is going to release a testing version of Windows 10 called Windows Technical Preview to public on October 1st, 2014 i.e. tomorrow which will be available absolutely free to download and testing. Since it’ll be a testing build, users should not use it as primary OS but you can test its new features by installing it on a different partition i.e. dual boot system or by installing it virtually using a virtualization software.

Windows 10 Technical Preview will be available in both versions: 32-bit (x86) and 64-bit (x64). Get ready to download a 3GB+ ISO file of Windows 10 Technical Preview.

Windows 10 Technical Preview will be available for download at following link:

Download Windows 10 Technical Preview