520
On Sunday , Brad Smith , Microsoft ’s president and chief legal officer , wrote a blog post describing the company ’s efforts to stop the ransomware ’s spread , including an unusual step it took to release a security update for versions of Windows that Microsoft no longer supports .
 ( patch vulnerability: release,  a security update: patch, Windows: vulnerable system, Microsoft: releaser) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( patch vulnerability: release,  a security update: patch, Windows: vulnerable system, Microsoft: releaser) 