Businesses and services across the globe have started to slowly recover after a massive IT outage affected computer systems for hours from Thursday into Friday. Airlines, banks and hospitals were among the hardest-hit after the cybersecurity firm Crowdstrike released a faulty software update which caused computers operating Microsoft Windows to crash. Crowdstrike’s CEO George Kurtz apologised for the chaos and said the company had issued a fix but warned it could be “some time” before all systems were running normally. “All of Crowdstrike continues to work closely with impacted customers and p…