Microsoft 365 Outage Disrupts Email, Teams and Copilot Worldwide

A global Microsoft 365 outage left millions without Outlook, Teams and Copilot for more than 12 hours. Microsoft says it has seen no sign of a cyberattack.

The problem began Thursday around 11 a.m. Eastern, when users could not reach Exchange Online mailboxes. Downdetector recorded over 130,000 Outlook problem reports in the US at the peak, and reports reached 74 countries and territories within about an hour.

Microsoft said a large number of servers became unexpectedly unavailable, pushing load onto the rest of its infrastructure. Early Friday it reported only "marginal success" in recovery.

Government offices in Australia and Japan were affected, along with US city governments, and the US House of Representatives. OpenAI and Anthropic reported connector issues. IndiGo and Akasa Air said their email support was hit, though flights ran normally. Workhorse Group postponed its earnings call.

Microsoft executive Charles Lamanna said there was no indication of malicious activity. Online, some users joked that engineers should take their time. Banks warned customers about outage related scams.