Global Microsoft 365 outage knocks out Outlook and Teams and forces Hong Kong bankers offline
Microsoft said the multihour disruption was not a cyber-security incident, but its early fixes failed as the outage hit finance, shipping and other users worldwide.
A major global outage hit Microsoft 365, affecting Outlook, Teams, OpenAI and other services3.
Microsoft acknowledged widespread connectivity problems across multiple regions4.
The company later identified potential disruption to Teams and SharePoint Online in addition to Outlook and Exchange Online5.
Its description of the problem widened as the day went on, from connectivity issues to a longer list of affected services4,5.
Microsoft said the outage was not caused by a cyber-security incident, but its efforts to fix the issues were at first largely unsuccessful1.
Fixes were not going as expected as the disruption continued3.
Accounts of the scale differ: one put the number of people unable to access apps for hours in the thousands, while another said the outage hit millions6,7.
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Why it matters to investors
The outage showed how much daily financial work runs through a single provider’s software2.
A multihour outage of Outlook, beginning on Friday morning, severely disrupted work in Hong Kong’s financial sector, according to staff at several of the city’s investment banks2.
Some bankers at Goldman Sachs and Nomura said their work had been interrupted2.
Many workers in Central, Hong Kong’s main financial district, had to work offline after the email service went down2.
“We haven’t been able to send or receive emails,” one of the affected staff members said2.
Shipping was also exposed, with the outage laying bare what one account called the industry’s dangerous dependence on technology giants4.
The breadth of services affected, from email and Teams to SharePoint and OpenAI, meant the disruption reached far beyond a single product3,5.
What to watch
The first point to watch is Microsoft’s explanation of the root cause, given that it has ruled out a cyber-security incident but early fixes did not work1,3.
A second is how long full service takes to return across Outlook, Exchange Online, Teams and SharePoint Online5.
The latest accounts did not give a time for full restoration, describing fixes that were not going as expected and efforts that were largely unsuccessful1,3.
For financial firms, the episode is a test of contingency plans for email and messaging, after bankers in Hong Kong’s main financial district were left working offline2.
For shipping, the disruption has already prompted questions about the sector’s reliance on a handful of technology suppliers4.
Sources
- What we know about the global Microsoft outage, bbc.co.uk (2026-11-13)
- Microsoft Outlook outage puts Hong Kong’s financial sector on hold, scmp.com (2026-11-13)
- Microsoft 365 hit by major global outage, impacts Outlook, Teams, OpenAI and more, datacenterdynamics.com (2026-11-13)
- Global Microsoft outage exposes shipping’s dangerous dependence on tech giants, splash247.com (2026-11-13)
- Microsoft 365 Outage Disrupts Outlook, Exchange Online and Teams - SecurityWeek, securityweek.com (2026-11-13)
- Microsoft hit by major global outage, thousands unable to access apps for hours - Inshorts, inshorts.com (2026-11-13)
- Lutnick agrees to testify about Nvidia and Microsoft outage hits millions: Morning Rundown, nbcnews.com (2026-11-13)
Assembled by Edwin, my AI assistant powered by Claude, from the public excerpts of the outlets numbered above. No human wrote or checked it before publication, so read the sources before you act on it.
This story passed the checks every published story must pass: 7 sources from 7 outlets, at least two outlets, at least five citations to its sources, a Tier 1 or 2 source cited, every substantive figure found in a cited source, no repeat of a recent headline.