Microsoft Outlook users are experiencing email access and connectivity problems on Thursday, November 12, 2026. Reports describe Outlook login failures, inboxes that do not load, connection and synchronization errors, and difficulty accessing email through both web and desktop applications. Some users have also reported delays accessing Exchange Online mailboxes. Microsoft has acknowledged an Exchange Online service incident, although it has not said that every Outlook user is affected.
Is Microsoft Outlook Down Right Now?
Microsoft has acknowledged incident EX1550543. In its incident description, the company said: “Users may be unable to connect to their mailboxes in Exchange Online through multiple connection methods.” That makes this an official service incident rather than simply a collection of isolated complaints from individual users.
The available information does not establish that Outlook is down for everyone. Service impact can differ by region, account, connection method and the part of Microsoft's infrastructure handling a request. Users who can sign in normally may not see any interruption, while others may be unable to open their inbox or send and receive messages.
What Happened to Microsoft Outlook?
Microsoft said it identified connectivity errors affecting a portion of the Exchange Online infrastructure responsible for receiving and processing mailbox access requests. When those requests do not complete normally, Outlook can show login problems, connection warnings, a blank or endlessly loading inbox, or synchronization failures.
The affected connection methods identified in the incident include:
- Outlook on the web.
- Messaging API (MAPI).
- Exchange ActiveSync (EAS).
- Representational State Transfer (REST) API.
Because Outlook applications and other approved clients use these services to reach Exchange Online mailboxes, a problem in this layer can affect web, desktop and mobile access without necessarily indicating a fault with a user's device.
Which Countries and Users Are Affected?
Microsoft's stated impact scope includes North America, Latin America, Canada and Chile. Those locations are the official geographic information available in the incident reporting at the time of publication.
Users in other locations have also shared reports of Outlook login problems and emails not loading. Those reports are useful signals that the issue may be visible beyond the stated scope, but they do not independently confirm a worldwide outage. The safest description remains a regional and service-level Exchange Online incident with reports from users elsewhere.
What Is Microsoft's Response?
Microsoft said it was investigating the connectivity errors in part of its Exchange Online infrastructure. According to its latest reported update, the company had collected networking logs to investigate the source of the problem. Incident reference EX1550543 remains the key identifier for status checks.
Latest update: November 12, 2026
Microsoft is investigating Exchange Online connectivity errors affecting mailbox access. The company is reviewing network logs to identify the source of the problem.
At the time of publication, Microsoft had not announced a confirmed root cause or final resolution. This report does not assign a cause beyond the connectivity errors described by Microsoft.
Why Is Outlook Not Working?
There is an important difference between a Microsoft-side service disruption and a local device or internet connection problem. When Exchange Online infrastructure experiences connectivity errors, a user's computer, phone and internet connection can be working correctly while Outlook still cannot reach the mailbox.
A local restart or network check can be useful for ruling out an individual problem, but it may not resolve an infrastructure-level Microsoft 365 outage. Microsoft has not confirmed DNS problems, a cyberattack, server overload or a software update as the cause, so those explanations should not be treated as established facts.
What Can Outlook Users Do During the Outage?
- Check Microsoft's official service status pages for incident updates.
- Avoid repeatedly changing passwords when Microsoft-side connectivity problems are confirmed.
- Try accessing Outlook again after some time, since service impact can change as Microsoft investigates.
- Check whether an existing email client or another authorized mailbox access method works.
- Avoid repeatedly reinstalling Outlook or deleting account data, which may not help with a server-side incident.
- If an email is urgent, use an alternative communication method while mailbox access is disrupted.
Local troubleshooting cannot always fix a Microsoft-side outage. Users should avoid actions that could remove locally stored account information unless they have a separate reason and know how to restore it.
How to Check If Microsoft Outlook Is Still Down
Users can check for new incident announcements and recovery updates through these sources:
- Microsoft 365 service status
- Microsoft 365 admin center
- Microsoft 365 Status updates on X
- Downdetector Outlook reports
Microsoft's own status channels should be treated as the primary source for incident scope and recovery. Downdetector and social media reports can help show whether more users are experiencing symptoms, but they do not replace Microsoft's service notices.
Frequently Asked Questions
Is Microsoft Outlook down today?
Microsoft has acknowledged Exchange Online incident EX1550543, and some users cannot connect to their mailboxes. The incident does not mean every Outlook user is affected.
Why is Outlook not loading my emails?
Connectivity errors in part of Exchange Online infrastructure can prevent Outlook from reaching and synchronizing a mailbox.
Is Microsoft Outlook down worldwide?
A worldwide outage has not been confirmed. Microsoft's stated scope includes North America, Latin America, Canada and Chile, with additional user reports elsewhere.
Is Outlook.com affected by the outage?
Some Outlook.com or Microsoft 365 users may be affected when their mailbox access uses an impacted Exchange Online service. Microsoft has not said every Outlook.com account is affected.
Can I access Outlook through my phone?
Mobile access may also be affected if it relies on Exchange ActiveSync or another impacted connection method. Results can vary by account and location.
When will Microsoft Outlook start working again?
Microsoft had not announced a confirmed recovery time at publication. Monitor official status updates for confirmation.
How can I check Microsoft's outage status?
Check Microsoft's service status page, the Microsoft 365 admin center, the MSFT365Status account and Downdetector's Outlook reports.
Conclusion
The Microsoft Outlook outage is linked to an Exchange Online service incident, EX1550543, involving connectivity errors that can prevent mailbox access through multiple methods. Microsoft is investigating the issue and reviewing network logs, but a confirmed root cause and final resolution had not been announced when this article was published.
Users should monitor Microsoft's official service updates for confirmation that access has been restored. Follow DailyUpdates for further technology and breaking-news coverage, including our related technology reporting.