While 0patch Agent works on Windows versions older than Windows 7 and 2008 R2 (all the way back to, including, XP and Server 2003), we issue very few patches for these 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.
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