Microsoft IT outage live: Travellers still stranded as experts warn problem is likely to happen again

Workers globally may not be paid on time due to a major IT outage causing chaos around the world, payroll businesses have warned.

The IT outage has resulted in queues and delays at airports, disruption to GP services and payment failures in some shops.

Cybersecurity firm CrowdStrike is “actively working” to fix a “defect” in an update for Microsoft Windows users which sparked the outage.

Indie rock band Bombay Bicycle Club have announced the rescheduled date of a music festival performance they missed due to the global IT outage.

The British group, comprised of Jack Steadman, Jamie MacColl, Suren de Saram and Ed Nash, were due to play Poolbar Festival in the Austrian town of Feldkirch on Friday but missed it due to a cancelled flight.

In a post to Instagram on Friday evening they said: “Unfortunately our flights to get to tonight’s Poolbar Festival show were cancelled because of the IT outage.

NHS England has warned of “continued disruption” to GP services into next week from the global IT outage.

A flawed update rolled out by cybersecurity firm CrowdStrike knocked many offline around the world on Friday, causing flight and train cancellations and crippling some healthcare systems.

A fix was deployed for a bug in the update, which affected Microsoft Windows PCs, on Friday, as CrowdStrike’s chief executive said it would take “some time” for systems to be fully restored.

Across England, GP surgeries reported being unable to book appointments or access patient records on Friday as their EMIS appointment and patient record system went down.

An NHS spokesperson said: “As practices recover from the loss of IT systems on Friday, there may be some continued disruption, particularly to GP services, in some areas into next week as practices work to rebook appointments.

“The advice for Monday remains that patients should attend appointments as normal unless told otherwise.”

The global IT outage caused by CrowdStrike’s update affected 8.5 million Windows devices, Microsoft has said.

Estimating the impact of the update, Microsoft said it had affected less than 1 per cent of Windows machines.

“While the percentage was small, the broad economic and societal impacts reflect the use of CrowdStrike by enterprises that run many critical services,” the firm said in a statement.

“This incident demonstrates the interconnected nature of our broad ecosystem - global cloud providers, software platforms, security vendors and other software vendors, and customers.

“It’s also a reminder of how important it is for all of us across the tech ecosystem to prioritise operating with safe deployment and disaster.”

Before this week, CrowdStrike was known for finding the cause of problems, rather than causing them. The company – headquartered in Austin, Texas, but with a reach across the world – was most famous for having investigated large-scale hacks, such as those on Sony Pictures and breaches at the Democratic National Committee that it blamed on Russian spies.

It has built a huge business out of that and other work. It was worth $80bn (£62bn) when trading on the Nasdaq closed on Thursday – though its share price has since fallen by 20 per cent. It reported revenues of $3bn in the last year.

CrowdStrike was founded in 2011 – by a team that included George Kurtz, the CEO that has been representing the company as it recovers from the problems – and immediately caught the interest of investors. The year after, it launched with a $26m investment round, and it has gathered more investment since.

Technology editor Andrew Griffin reports: