Ongoing since 06:25 PM UTC.
Microsoft is having a service outage that affects Outlook and Exchange Online mailboxes for users across the Americas. It started around 12:30 PM ET today. You may be unable to open your mailbox, or email may not send or arrive normally. This affects the desktop app, the web version and mobile. The problem is inside Microsoft’s cloud, not in your company’s systems or devices, and there’s nothing you need to do on your end. Microsoft is investigating and tracking it as incident EX1550543. Some reports also mention problems with Teams, OneDrive and other Microsoft 365 services. In the meantime: Please don’t reset your password, reinstall Outlook or change your account settings. None of these will fix the problem. For anything urgent, use the phone or another way to reach people. Email sent during the outage may arrive late once service is restored. Bit by Bit is watching Microsoft’s updates and will let you know when service is back. If you still have problems after Microsoft says the outage is resolved, contact our help desk as usual.
Update timeline
- investigating Nov 12, 2026, 06:25 PM UTC
Microsoft is having a service outage that affects Outlook and Exchange Online mailboxes for users across the Americas. It started around 12:30 PM ET today. You may be unable to open your mailbox, or email may not send or arrive normally. This affects the desktop app, the web version and mobile. The problem is inside Microsoft’s cloud, not in your company’s systems or devices, and there’s nothing you need to do on your end. Microsoft is investigating and tracking it as incident EX1550543. Some reports also mention problems with Teams, OneDrive and other Microsoft 365 services. In the meantime: Please don’t reset your password, reinstall Outlook or change your account settings. None of these will fix the problem. For anything urgent, use the phone or another way to reach people. Email sent during the outage may arrive late once service is restored. Bit by Bit is watching Microsoft’s updates and will let you know when service is back. If you still have problems after Microsoft says the outage is resolved, contact our help desk as usual.
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