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Outlook | Web | Outlook on the web for business | Email
Sending, receiving, and organizing email in Outlook on the web for business
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Hello Mason,
There is a reported Microsoft 365 service disruption that may explain why you have been unable to access Outlook.
According to the Microsoft 365 Service Health dashboard, incident MO1550821, which began on November 12, 2026 is affecting several services, including Exchange Online.
The reported impact includes users being unable to access their Outlook mailboxes and possible delays in email delivery.
The incident is currently listed as Service degradation, and the available information does not specify an estimated resolution time.
If you're using a Microsoft 365 business account, you or your administrator can check for updates by following these steps:
- Sign in to the Microsoft 365 admin center.
- Navigate to Health > Service health.
- Look for incident MO1550821 to review the latest information.
Regarding your compensation concerns, eligible business subscriptions may qualify for service credits under their service agreements. You can contact Microsoft 365 billing support to discuss the available options.
Since your issue may be related to this disruption, I recommend checking the service status before making changes to your Outlook configuration.
Sincerely.