Microsoft has been struggling to keep up with the growth of Android and iOS.
The operating system has now become one of the top four operating systems in the world, and that is a huge deal for Microsoft, which had previously relied on the likes of Symbian and OS X for its software.
However, Windows 10 is now only a fraction of its predecessor, and the platform still has plenty of problems to overcome.
For example, the OS does not support Windows 10 Pro, meaning that the operating system only works on a small subset of devices with the ability to run Windows 10.
The new OS is also missing a number of the features that have made Windows so popular, such as the ability for users to save their settings, search for and download apps, and manage their contacts.
And, as with any OS, there is still a lot of work to do to make it run on a wider range of devices.
But that will be easier to do with a fresh batch of features coming with Windows 10 Creators Update.
Read more about Windows 10:Microsoft, Symbian, and OSX