While Microsoft griped about NSA exploit stockpiles, it stockpiled patches: Friday's WinXP fix was built in February

And it took three months to release despite Eternalblue leak

When the WannaCrypt ransomware exploded across the world over the weekend, infecting Windows systems using a stolen NSA exploit, Microsoft president Brad Smith quickly blamed the spy agency. If the snoops hadn't stockpiled hacking tools and details of vulnerabilities, these instruments wouldn't have leaked into the wild, sparing us Friday's cyber assault, he said."