Earlier this week, Beta Archive posted Windows 10 source code related to USB, storage and WiFi drivers on its free FTP site. Now, a spokesperson for Microsoft has confirmed to The Verge that this code, from the Shared Source Kit, is genuine.
The breach was initially thought to be massive; The Register reported that the leak consisted of around 32TB of files. They claimed it included builds of Windows that haven't yet been released. However, it later became clear that the leak was smaller than originally reported, and what's more, much of this data had been made available. The Shared Source Kit has already been distributed to Microsoft's partners and licensees through the Shared Source initiative.