Microsoft restores 365 services after 24-hour global outage, denies cyberattack

what happened

Microsoft reported that its Microsoft 365 services have been restored after a worldwide disruption that affected Outlook, Teams and other apps for more than a day, according to Cointelegraph. The company stressed that the failure was an internal technical problem and had no connection to hacking or to AI agents.

According to Microsoft, the fault appeared after a recent network change tied to an earlier upgrade of network capacity. Engineers fixed the root cause and brought services back in stages, checking stability before each next step. The company apologized to customers and promised a full post-incident report once its review is complete.

The failure began on Thursday and hit Exchange Online mailboxes, along with features linked to Outlook, Teams and Copilot. Public bodies in Japan, Singapore and the US reported email difficulties, and the link between Microsoft 365 and AI assistants was disrupted as well. OpenAI and Anthropic later said their Microsoft 365 connectors were working again.

why it matters

For markets, the episode is a reminder of how much business depends on a handful of cloud platforms: prolonged outages can halt operations and raise questions about operational risk at large software vendors. Investors will likely watch the post-incident report for any costs or reputational fallout, though the company has not disclosed any financial figures.

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