Does 0patch add value on older Windows versions such as Windows XP or Server 2003?

While 0patch Agent works on Windows XP and Server 2003, we issue very few patches for these older versions. For example, we've only issued 3 micropatches for Windows Server 2003: BlueKeep, EsteemAudit and CVE-2017-7269, all of which were 0days at the time and it seemed they'd remain unpatched as 2003 was long out of official support. Microsoft subsequently issued fixes for all three issues. That said, if another critical 0day comes out for an older Windows version, we'll certainly try to make a micropatch for it.

Aside from that, if you're using some Windows application that we issue a micropatch for (like for instance here, here, here, here, or here) on older Windows systems, such micropatch will be applied there too.