The boss of the cybersecurity firm responsible for worldwide IT outages admits it could be "some time" before all systems are back up and running
While the software bug has been fixed, experts say the manual reboot of each affected Microsoft computer will take a huge amount of work
Thousands of flights have been cancelled, with banking, healthcare and payment systems all affected
In the UK, GPs have been struggling to access records, pharmacies have been hit and TV channels knocked off air
Meanwhile at London's Stansted airport, some check-ins are being done manually but "flights are still operating as normal".
"Our main operational systems are unaffected," a spokesperson says, but "some retail payment machine services have been impacted".
Amsterdam's Schiphol airport is the latest to report delays caused by the IT outage.
"The outage has an impact on flights flying from and to Schiphol," a spokesperson says, adding it is not yet clear how many flights are affected.
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The London Stock Exchange says it's working as normal - but says there are problems with its RNS (regulatory news service).
"RNS news service is currently experiencing a third party global technical issue, preventing news from being published on www.londonstockexchange.com," the statement says.
"Technical teams are working to restore the service. Other services across the group, including London Stock Exchange, continue to operate as normal."
Image source, ReutersA blue error screen on a checkout at a department store in Brisbane, Australia
Simon Atkinson
Reporting from Sydney airport
It has been an hour of uncertainty and mild chaos here at Sydney Airport.
First departure board information screens went blank - with at least one airline, Jetstar, announcing it could not check passengers in.
Its apology on the public address system firmly blamed Microsoft.
About half an hour later Virgin Australia said there had been a “total ground stop” with “no flights going in or out”.
But things do seem to be moving again. Virgin Australia has started boarding flights (including mine) and so it looks like the skies above Australia’s biggest city will soon be filled with aircraft again.
Not everyone is thrilled. In perhaps stereotypical Australian fashion, I overheard one passenger say he was a bit disappointed not to be squeezing in a couple of extra Friday night airport beers.
United, Delta and American Airlines - which are all based in the United States - have issued a "global ground stop" on all of their flights.
Flights that are currently airborne will continue, but no further flights will take off for now.
Further from that post from Edinburgh, European airline Ryanair says it's experiencing "potential disruptions across the network" - which it says is due to a third party outage.
The airline is advising that anyone travelling today should check the Ryanair app for updates on their flight.
Morgan Spence
Reporting from Edinburgh airport
Here at Edinburgh airport there’s been disruption to services as the computer error caused departure screens to malfunction.
Departure boards in the main terminal building appeared to freeze, showing out-of-date information about gate numbers and take off times - meaning some passengers have missed their flights.
Earlier this morning the fire alarm in the main terminal building sounded, thought to be have been triggered by the same computer error.
Edinburgh airport said it was working to resolve the issue.
Australia's Telstra Group, a telecommunications company, says it is also facing disruption.
Replying to a post on X, external, formerly Twitter, the company said "global issues affecting CrowdStrike and Microsoft are disrupting some of our systems. The issue is causing some holdups for some of our customers and we thank you for your patience."
Image source, Sky NewsA screengrab of Sky News Channel as of 08:10BST
In the UK, Sky News channel is off air due to the outages.
The channel has not been able to broadcast live this morning, the company's executive chairman says.
Several airports and airlines have reported issues with their IT systems.
Berlin airport posted on X, external that it is experiencing delays to check-ins due to a "technical fault".
In Spain, an "incident" has been reported at all of the country's airports.
"We are working to solve it as soon as possible. Meanwhile, operations are continuing with manual systems," the Spanish airport operator says.
A major train company has warned passengers to expect disruption as it is suffering "widespread IT issues".
All four of Govia Thameslink Railway's brands - Southern, Thameslink, Gatwick Express and Great Northern - posted on social media: "We are currently experiencing widespread IT issues across our entire network.
"Our IT teams are actively investigating to determine the root cause of the problem.
"We are unable to access driver diagrams at certain locations, leading to potential short-notice cancellations, particularly on the Thameslink and Great Northern networks.
"Additionally, other key systems, including our real-time customer information platforms, are also affected.
"We will provide additional updates when we can. In the meantime, please regularly check your journey before you travel."
Microsoft says it is taking "mitigation actions" after service issues, AFP news agency reports.
It says its outage started at about 18:00 ET (23:00 BST) on Thursday.
The company says it is investigating issues with cloud services in the US, and an issue impacting several of its apps and services.
Leading banks, media outlets and airlines are currently suffering major IT outages.
Flights have been grounded at Sydney airport, United Airlines has stopped flying, and the London Stock Exchange group’s platform is experiencing issues.
Stay with us as we bring you all the latest news on this developing story.