Iran Press/Europe: Businesses, banks, hospitals, and airlines were among the worst hit after cyber-security firm Crowdstrike issued a faulty software update that affected Microsoft Windows.
Crowdstrike's CEO apologised for the disruption and said a fix had been issued, but admitted it could be "some time" before all systems were back up and running.
While some airline services are beginning to return to normal after thousands of flights were canceled, operators expect some delays and cancellations to persist through the weekend.
Many businesses are now dealing with backlogs and missed orders that could take days to resolve.
Health services in Britain, and Germany also suffered problems, with some operations canceled.
The global chaos has sparked concern over the vulnerability of the world's interconnected technologies, and the extent to which a single software glitch could have such widespread impact.
The issue began at 19:00 GMT on Thursday, affecting Windows users running the cybersecurity software CrowdStrike Falcon, according to Microsoft, though the full extent of the problem only became clear by Friday morning.
But by Friday evening, the problems were easing in many parts of the globe, with many airports saying that while there were still issues with check-in and payment systems, most flights were now running. Hong Kong International Airport has resumed normal operations, according to Chinese state media.
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