Η Microsoft announced that the support of its first version Windows 10, will be completed on May 9, 2017.
The company originally planned to stop supporting the first official release of Windows 10 on 26 March 2017, but it extended it to May 9.
Windows 10 uses a different support model from older versions of the operating system, such as Windows 7 or Windows 8.
In previous versions of Windows, the end of support date was always the end of life of the operating system. The circulation of one service pack in an earlier version of Windows, such as the last SP released for Windows 7, it marked the beginning of the end for system support, especially if you chose not to install the SP.
Microsoft has changed this particular model with the coming of Windows 10. Windows 10 support is determined by the current version used by businesses. 
Basically, there are three service options that Microsoft currently maintains:
Current Branch (CB) - for all versions of Windows 10.
Current Branch for Business (CBB) - only for professional versions of Windows 10.
Long-Term Support Branch (LTSB) - for long-term support, only for businesses
The main difference between the Current Branch and the Current Branch for Business is that the updates released for Devices with Current Branch are immediately made available to Current Branch for Business with a four-month delay.
The logic of this move protects businesses from any bugs we typically see with Microsoft updates and essentially makes the average Windows user a "beta tester."
Naturally no one can talk because the company actually silently distributes Windows 10 for free.
Of course we're seeing a much faster release of Microsoft's operating system updates, thanks to the hundreds of thousands registered in program Windows Insider, που δοκιμάζουν τις ημιτελείς εκδόσεις (beta builds), και τους millions regular Windows users when an error occurs on their devices is reported via telemetry to Microsoft developers.
The big winners are the ones who pay to have a stable operating system, that is business.
