Microsoft patching systems as far back as XP? WannaCry is BIG, and the problem is…. there’s going to be systems out there still not patched due to laziness or no internet connection and are vulnerable.

Seen a couple of XP boxes around — some self-service tills, ATMs, and payphones all use XP…

Decommissioned for years, Windows XP, 8, and Server 2003 get emergency update.

Source: WCry is so mean Microsoft issues patch for 3 unsupported Windows versions | Ars Technica