Microsoft Issues WanaCrypt Patch for Windows 8, XP
krebsonsecurity.com
krebsonsecurity.com
« Microsoft no longer supplies security patches for those versions of Windows. The software giant today made an exception to that policy »
From what https://blogs.technet.microsoft.com/msrc/2017/05/12/customer... describes, I think it would be more accurate to say
« Microsoft now supplies security patches for those versions of Windows only to people who pay for custom support. The software giant today made an exception to that policy »
(which would explain why it didn't take them long to come up with a patch).