Outlook Issue Resolution

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Hello, @Mayjor I hope you are doing well,

Microsoft has not published a specific ETA for full resolution yet. Because EX1550543 involves front-end connectivity across shared infrastructure, engineering teams are actively deploying mitigation steps and validating traffic recovery before committing to a firm timeline.

The most reliable way to see the next scheduled update time (and when Microsoft expects to share resolution progress) is directly inside your tenant:

Go to the Microsoft 365 Admin Center > Health > Service health > EX1550543.

Look at the "Next update by" timestamp at the top of the advisory, as Microsoft posts incremental status checkpoints there until the service is fully restored.

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Hello Mayjor,

Thank you for reaching out.

While a definitive final resolution time has not yet been confirmed, the latest update from Microsoft (as of Nov 13, 2026, 7:59 PM GMT+7) shows continued, encouraging recovery progress across affected regions. Broader improvements are now being observed in North America, alongside sustained improvements across much of Europe and positive recovery signals in Asia Pacific. However, some users may still experience intermittent access issues or delayed email delivery while mitigation progresses across the remaining affected infrastructure.

Technical teams are actively focusing on stabilizing the recovered infrastructure, reducing delayed email queues and backlogs, and validating service consistency across different connection methods. This incident continues to be treated with the highest urgency, and the next official status update is scheduled for today at 9:00 PM GMT+7.

If you have Microsoft 365 administrator privileges in your organization, you can sign in to the Microsoft 365 Admin Center to view live details:

• Sign in to the Microsoft 365 Admin Center.
• Go to Health > Service Health.
• Search for Issue ID: MO1550821.
• Select the issue and expand the details to review the latest updates, affected services, impact, and remediation information.

If you are unsure who your organization's administrator is, you can check guidance here: How can I find my Microsoft 365 admin? - Microsoft Support    

I will continue to monitor the case closely and keep you informed. Thank you for your patience and understanding.

Kind regards,

See attached recurring error we're getting once we launch Outlook.

Hope to get this issue resolved ASAP.

Thank you.