Major banks, media and airlines are currently suffering major disruption to vital services due to a cyber collapse.
Flights have been grounded at Sydney Airport, while United Airlines has suspended flights and the London Stock Exchange group platform is experiencing disruption.
The collapse has also affected some of the Albanian banks, which are facing difficulties to process foreign transactions due to the collapse of IT systems.
Microsoft: We are working on the solution
Microsoft says it is taking "mitigative actions" after the service problems, AFP news agency reports. The company says the outage began at around 18:00 ET (0000 BST) on Thursday.
Microsoft said it is investigating issues with cloud services in the US and an issue affecting some of its apps and services.
Train companies in Britain are affected
A major train company has warned passengers to expect disruption as it suffers a "massive IT systems outage".
All four Govia Thameslink Railway brands – Southern, Thameslink, Gatwick Express and Great Northern – posted on social media: “We are currently experiencing problems with IT systems across our network.
“Our IT teams are actively investigating to determine the root cause of the issue.
“We are unable to access driver diagrams in certain locations, leading to potential cancellations at short notice, 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 check your itinerary regularly before you travel.”
As disruptions spread, Berlin airport reports delays due to 'technical fault'
Some airports and airlines have reported problems with their IT systems.
Berlin Airport posted on X that it is experiencing check-in delays due to a "technical fault".
In Spain, an "incident" was reported in all the country's airports.
"We are working to resolve it as soon as possible. Meanwhile, operations are continuing with manual systems," says the Spanish airport operator. / The Guardian