Available to Insiders now. https://www.bit-tech.net/news/microsoft-previews-new-ransomware-protection-feature/1/
Follows WannaCry's infection vector https://www.bit-tech.net/news/petya-ransomware-variant-spreading-globally/1/.
Warns of 'nation-state' risks. https://www.bit-tech.net/news/bits/2017/06/14/microsoft-windows-xp-patch-tuesday/1
Just so long as you didn't reboot. https://www.bit-tech.net/news/bits/2017/05/22/wanakiwi-decrypts-wannacry/1
Not much hope for other OSes, though. https://www.bit-tech.net/news/bits/2017/05/19/wannacry-key-recovery-tool/1
Microsoft displeased with the NSA. https://www.bit-tech.net/news/bits/2017/05/15/wannacry-malware/1
Fixes your files free of charge. http://www.bit-tech.net/news/bits/2016/11/29/eset-crysis-decryption-tool/1
Free decryption for all. http://www.bit-tech.net/news/bits/2016/05/19/teslacrypt-master-key/1
Claims complete efficacy. http://www.bit-tech.net/news/bits/2016/01/27/malwarebytes-anti-ransomware/1
Free decryption for some victims. http://www.bit-tech.net/news/bits/2015/04/14/kaspersky-coinvault-keys/1
CryptoLocker inspires new attack. http://www.bit-tech.net/news/bits/2015/03/13/teslacrypt/1
NAS files encrypted, ransom demanded. http://www.bit-tech.net/news/hardware/2014/08/05/synolocker/1
Separate names with a comma.