Microsoft’s latest operating system, Windows 10, is off to the fastest adoption of any version of Windows ever, and is already in use (33 percent), or being piloted, by more than 96 percent of enterprises. However, while security was a major focus of Microsoft in designing the software – Windows Defender and Windows Firewall –  the huge success of the OS and the vast Windows installed base, which includes enterprise, SMB, public sector, and consumer, has made it a major focus of cybercriminals, too. CVE currently lists 166 Windows 10 vulnerabilities, and in an average week Avast prevents more than 2.3 million virus attacks on Windows 10 PCs.