Security News > 2020 > January > Windows 7 computers will no longer be patched after today
Simply put, we took the next 10 Windows malware samples that showed up for analysis at SophosLabs, checked that they ran on the previous versions of Windows and then threw them at the all-new Windows 7.
The problem is that "New" malware samples, together with new vulnerabilities and exploits, are likely to work on old Windows 7 systems in much the same way, back in 2009, that most "Old" malware worked just fine on new Windows 7 systems.
Even if the crooks stop looking for new vulnerabilities in Windows 7 and focus only on Windows 10, there's a fair chance that any bugs they find won't be truly new, and will have been inherited in code that was originally written for older versions of Windows.
Windows 10 is significantly more secure against exploitation by hackers than Windows 7 ever was, and retrofitting those new security features into Windows 7 is just not practicable.
There are numerous "Breaking changes" in Windows 10 that deliberately alter the way things worked in Windows 7 because they're no longer considered secure enough.