Global Microsoft 365 outage takes down Teams and Outlook
A global Microsoft 365 outage took down Teams and Outlook on Friday, with Word and Excel also reported affected. Microsoft was still working to restore services at midday, and it says it has ruled out malicious activity as the cause. In the Netherlands, municipalities, courts and universities were hit, and thousands of users were affected. BBC reporting points to a server outage. Treat the stated cause as Microsoft's own account until an incident review is published. The practical lesson is dependency. Email, chat, calendars and document access sat on one vendor, and when it failed, staff lost their normal channels at once. Security teams should check that incident response plans do not rely on the affected platform for alerts, call trees or crisis communication. Confirm that out-of-band contact lists and a secondary messaging route are current and tested. Watch for phishing that exploits the confusion, such as fake service restored or password reset notices. Document which business processes stalled, and for how long, so recovery targets can be tested against real data.