So, like many other new technologies, Windows 10 can run into some bugs and problems that are quite challenging to solve. However, nothing in this world can be absolutely perfect. While that is still a far cry from the tech company’s initial estimate of 1 billion users by 2018, the figures are still relatively astonishing. According to Microsoft, Windows 10 has around 400 million active users to date, making it four times more popular than Mac.