Exchange Online mailbox access degraded for Microsoft 365 in the Americas
Original title: Ask HN: Microsoft/Azure Outage?
Microsoft is investigating connectivity errors on part of Exchange Online under incident EX1550543; the status site is also failing to load.
Hacker News users report Microsoft cloud connections down, including mail, Teams, and multiple Microsoft 365 tenants. Microsoft’s status page lists a service degradation for Microsoft 365 in which users may be unable to reach Exchange Online mailboxes through Outlook on the web, MAPI, Exchange ActiveSync, and REST. Microsoft says it has identified connectivity errors on a portion of infrastructure that handles access requests and is reviewing networking logs, with a next update due Thursday, November 12, 2026, at 8:00 PM UTC. A status account says the reports concern the Americas.
Unconfirmed: Cause is unconfirmed; a commenter’s suggestion of an AWS issue is speculation, and Microsoft says investigation is ongoing.
- Incident identifier cited by Microsoft is EX1550543.
- Listed methods include Outlook on the web, MAPI, EAS, and REST.
- One reply says the status page returns 502 from Azure Front Door.
- Users also report Teams and other Microsoft 365 services affected.
- Vendors
- Microsoft
- Products
- Exchange OnlineMicrosoft 365
From the original article
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