Windows 10 is built with the power features of Windows 7 and 8.1, which makes it a robust operating system. It gained 65 million users in the first three days after its release.
Still counting and making Windows 10 as a universal platform for all the devices running the same operating system.
By Introducing “Windows as a service” utility, The Microsoft is offering Windows 10 Free
Source: Despite Issues, 6 Reasons Why Windows 10 is Best Windows Ever