http://wccftech.com/google-microsoft-windows-7-security/

"Risk of post-patch vulnerability exploitation is inevitable for software which can be freely reverse-engineered"

Microsoft is not a big fan of Google’s Project Zero, but the latter continues to spot security flaws in the Redmond software maker’s products and strategies. Mateusz Jurczyk, a Project Zero researcher, has now revealed how Microsoft putting Windows 10 as its first priority is neglecting Windows 7 at the risk of compromising user security.