Microsoft announces that 8.5 million computers were affected by the recent global computer outage.
A corrupted update to the Crowdstrike software caused a Windows outage. The computer failure affected computers worldwide from Thursday to Friday.
"We have long been talking in the industry about the inherent fragility of the fundamental elements of the internet, those small pieces of activity and infrastructure that underpin the whole and which, if they go wrong, can have very serious consequences on a global scale," said Ciaran Martin, former director of the UK's National Cyber Security Centre.
This is the first time the company has quantified the extent of the outage and suggests that it could be the worst cyber event in history.
Flights were unable to take off or land, some businesses were unable to accept card payments, and hospitals and clinics had to cancel their operations.
