A faulty update from cybersecurity provider CrowdStrike is knocking affected PCs and servers offline, forcing them into a recovery boot loop so machines can’t start properly. CrowdStrike is widely used by many businesses worldwide to manage the security of Windows PCs and servers.

Australian banks, airlines, and TV broadcasters first raised the alarm as thousands of machines started to go offline. The issues spread fast as businesses based in Europe started their work day.

UK broadcaster Sky News could not broadcast its morning news bulletins for hours this morning and showed a message apologizing for “the interruption to this broadcast.” Ryanair, one of the biggest airlines in Europe, also says it’s experiencing a “third-party” IT issue, impacting flight departures.

The Federal Aviation Administration (FAA) says it’s assisting airlines like Delta, United, and American Airlines due to communications issues. “The FAA is closely monitoring a technical issue impacting IT systems at US airlines,” says FAA spokesperson Jeannie Shiffer in a statement to The Verge. “Several airlines have requested FAA assistance with ground stops for their fleets until the issue is resolved.”

Berlin airport also warns of travel delays due to “technical issues.” The issues have also impacted many 911 emergency call centers in Alaska. One airline in India has even turned to handwritten boarding passes due to the outages.

“CrowdStrike is actively working with customers impacted by a defect found in a single content update for Windows hosts,” says CrowdStrike CEO George Kurtz in a post on X. “Mac and Linux hosts are not impacted. This is not a security incident or cyberattack.”

CrowdStrike says the issue has been identified, and a fix has been deployed, but fixing these machines won’t be simple for IT admins. The root cause appears to be an update to the kernel-level driver that CrowdStrike uses to secure Windows machines.

While CrowdStrike identified the issue and reverted the faulty update after “widespread reports of BSODs on Windows hosts,” it doesn’t appear to help machines that have already been impacted.

In a Reddit thread, hundreds of IT admins are reporting widespread issues. The workaround involves booting affected Windows machines into safe mode, navigating to the CrowdStrike directory, and deleting a system file. That will be troublesome on some cloud-based servers or even for Windows laptops deployed and used remotely.

“Our entire company is offline,” says one Reddit poster, while another says 70 percent of their laptops are down and stuck in a boot loop. “Happy Friday,” says one Reddit poster. It looks like IT admins worldwide will have a long day.

In what appears to be a separate outage, Microsoft is also recovering from several issues with its Microsoft 365 apps and services. The root cause of those issues was “a configuration change in a portion of our Azure backend workloads.”

Teams is a critical part of the company’s collaboration efforts, and competes directly with Slack.

The chat app is key for Microsoft.

After all, it was only back in September that the software titan claimed that Teams was the fastest growing business app in its history. This incident can probably be termed as growing pains — though it does not reflect all too well on the Redmond cloud.

Microsoft confirmed the presence of the issue on Twitter, with the support team admitting that there indeed was a problem with Teams.

Users around Europe and beyond began reporting issues connecting to the online collaboration platform around 10:00 UTC. Both the app and web versions of Teams were said to be affected, with user sessions reconnecting and requests to restart popping up.

This, when both Office 365 and OneDrive have faltered over the last few weeks.

Teams, obviously, is deeply integrated with Office 365, and that makes it an important piece of the productivity puzzle that the Seattle based company is aiming for. So much so that it replaced Skype for Business with this platform that combines workplace chat, meetings, notes and attachments.

Here’s hoping Teams is back up online soon.

Unlike some other recent outages that took a while to fix.