According to reports :BetaArchive .com contains 8TB of compressed data that comprise of 32TB of internal builds for Windows 10 and Windows Sever 2016 and even software blueprints. The data seems to still be accessible to individuals with access to the private servers at BetaArchive and has been termed by some as being even bigger than the windows 2000 source code leak back in 2004.
It is believed the data has been exfiltrated from Microsoft’s in-house systems since around March. The leaked code is Microsoft’s Shared Source Kit: according to people who have seen its contents, it includes the source to the base Windows 10 hardware drivers plus Redmond’s PnP code, its USB and Wi-Fi stacks, its storage drivers, and ARM-specific OneCore kernel code. Anyone who has this information can scour it for security vulnerabilities, which could be exploited to hack Windows systems worldwide. The code runs at the heart of the operating system, at some of its most trusted levels. In addition to this, hundreds of top-secret builds of Windows 10 and Windows Server 2016, none of which have been released to the public, have been leaked along with copies of officially released versions.
An administrator at BetaArchive said that acknowledging that a folder entitled Shared Source Kit did exist but has been removed for further review. His full statement is as follows
First of all let us clear up a few facts. The “Shared Source Kit” folder did exist on the FTP. We have removed it from our FTP and listings pending further review just in case we missed something in our initial release. We currently have no plans to restore it until a full review of its contents is carried out and it is deemed acceptable under our rules.
If any of this should change we will remove these builds from the FTP and we will happily comply with any instructions to do so by Microsoft.