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Outlook and Teams can fail at the same time without sharing the same immediate cause. Microsoft 365 business email is generally delivered through Exchange Online, while Teams relies on services including Microsoft Entra ID, Exchange Online, SharePoint Online, and OneDrive for Business. To tell whether a disruption is Microsoft-wide, tenant-specific, or local, check your organization’s Service Health dashboard first. This is a troubleshooting guide, not a live outage alert: the information available for this article does not establish that a specific Outlook-and-Teams outage is currently active.
What “Microsoft 365 is down” can mean
Microsoft 365 is a collection of services, not one switch. A problem can affect a particular feature, service, region, group of tenants, or individual user. A service may also be slow or unreliable rather than completely unavailable.
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Outlook is the name used for several email apps and services. For many organizations, Microsoft 365 business email is provided by Exchange Online. An Exchange Online issue can therefore affect Outlook on the web, desktop Outlook, or mobile Outlook even when the app itself is not the source of the problem. Consumer Outlook.com has a separate status and support path from a work or school Microsoft 365 tenant.
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Teams is another service with its own features and dependencies. A user might be able to sign in but find chats stale, messages delayed, meetings unavailable, or files missing. A Teams problem can involve identity, messaging, files, or a dependent Microsoft service rather than the Teams app alone. Microsoft describes Teams’ service relationships in its Teams operations guidance.
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How to check whether there is an outage
For a work or school Microsoft 365 account
- Sign in to the Microsoft 365 admin center.
- Open Health, then select Service health.
- Look for an active incident or advisory affecting Exchange Online, Outlook, Teams, Microsoft Entra ID, or another related service.
- Open the issue and note its ID, affected services, reported user impact, current status, and latest update.
- If no listed issue matches the symptoms, use Report an issue from Service Health or contact your organization’s Microsoft support channel.
Service Health is the most relevant official view for business and enterprise tenants because it provides tenant-associated incident information and recent issue history. Microsoft documents its dashboard and status labels in View service health.
If the admin center is unavailable
Check Microsoft’s public service-status page or the Microsoft 365 Status account for broad announcements. These are useful fallbacks, but they do not replace tenant-specific Service Health. The public page also serves consumer status information, so a clear page there does not by itself prove that a work tenant is unaffected. Microsoft explains the distinction in its incident-readiness guidance.
Independent outage-reporting sites and social posts can help show that other people are reporting trouble. They are not confirmation of Microsoft’s affected services, geographic scope, or root cause.
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Microsoft’s Service Health terminology helps distinguish a total interruption from a partial problem:
- Advisory: Microsoft is aware of a condition that may affect users, though the service or some functions remain available.
- Service degradation: Performance or functionality is impaired; some use may still be possible.
- Service interruption: Access or a major function is significantly and consistently affected.
- Investigating: Microsoft is working to determine the cause and impact.
- Restoring service: Microsoft is applying a corrective action.
- Extended recovery: The main issue may be mitigated, while recovery continues for affected users or components.
- Service restored: Microsoft considers the service recovered. Some users may still encounter residual symptoms as systems or clients catch up.
A “healthy” status is useful evidence, but not conclusive proof that every user, region, or feature is working. The problem may be specific to a tenant, network path, account, or client, or recovery may not yet be complete.
Global outage or local problem? Use the pattern of symptoms
| What you observe | What it may indicate | Useful next check |
|---|---|---|
| Several coworkers in different locations have the same failure | A Microsoft incident or an organization-wide issue becomes more plausible. | Check Service Health and ask whether users on different networks see the same thing. |
| Outlook and Teams fail across browser, desktop, and mobile | A shared identity or Microsoft 365 dependency may be involved. | Check whether users can sign in to other Microsoft 365 services; administrators should review Entra ID and related service health. |
| Only one device is affected | A local app, profile, cache, operating-system, or network problem is more likely. | Try the service in a browser or on another device before changing or removing local data. |
| Only one user is affected | An account, license, Conditional Access, or user-profile issue may be involved. | Ask an administrator to review account status, licensing, sign-in logs, and applicable access policies. |
| Teams works on cellular data but not office Wi-Fi | A proxy, firewall, DNS, VPN, or other network-path issue is possible. | Report the difference to IT; do not change corporate network settings yourself. |
| Outlook on the web works but desktop Outlook does not | The desktop client, its profile, an add-in, or local authentication state may be the issue. | Use the web version temporarily and ask IT to investigate the client. |
| Microsoft reports an incident, but your symptom does not match its description | You may have a separate local or tenant-specific problem as well as the published incident. | Compare the incident’s described impact with your actual symptoms and report a mismatch. |
Cross-product sign-in failures deserve special attention. If users cannot authenticate to Outlook, Teams, and the admin center, an identity dependency such as Microsoft Entra ID may be involved; that pattern alone does not establish the cause. Similarly, browser-versus-app testing is a diagnostic clue, not a guarantee: clients can differ in cached content and authentication state.
What users should do during a disruption
- Check official status before making major changes. During a confirmed service incident, reinstalling apps, deleting Outlook profiles, or changing passwords is unlikely to fix Microsoft-side impact and can introduce new problems.
- Test another approved access route. If desktop Outlook fails, try Outlook on the web or mobile. If the Teams app fails, try Teams in a browser. A different network, such as a mobile hotspot, can help identify a network-path problem if your organization permits it.
- Verify before resending. If Outlook reports an error, check Sent Items or another approved view before submitting the same message again. A delayed or ambiguous response does not always mean the message was never sent.
- Use an approved backup channel for urgent work. Phone, SMS, or your organization’s designated incident-management channel may be more reliable than sending repeated messages through a service that is failing.
- Give IT useful evidence. Record the time and time zone, affected app and account, exact error text, what works in a browser or on another network, and a screenshot if permitted. Avoid including sensitive information in screenshots or public posts.
Do not delete local app data or profiles during a service incident unless Microsoft’s guidance or your IT team specifically directs you to do so. Some fixes vary by Teams client generation and operating system. For a Teams launch issue that persists after service health checks, consult Microsoft’s current Teams client launch troubleshooting rather than applying an old cache path or reset command.
Administrator checklist
- Confirm tenant Service Health. Check the relevant services and open the incident details rather than relying only on a public status headline.
- Capture the record. Note the issue ID, stated start time, affected services, current status, user impact, and time of the latest update.
- Compare scope and symptoms. Determine whether reports affect Exchange Online, Teams, Entra ID, SharePoint or OneDrive, the admin center, a particular region, or only a subset of users. Compare the Microsoft description with your help-desk reports.
- Check the dashboard view. Ensure the relevant service or issue is not being missed because of the current view or filters.
- Report an unlisted problem. Use Report an issue in Service Health. Open a support case if the issue is absent from the dashboard, appears unique to your tenant, or requires case-specific assistance.
- Communicate clearly. Tell staff what is affected, what appears unaffected, which workaround is approved, and when to expect the next update. Do not promise a restoration time unless Microsoft has provided one and you clearly attribute it.
- Verify recovery. Check delayed mail and calendar changes, Teams message synchronization, meeting artifacts, file uploads, and dependent automation. Ask affected users to confirm their critical workflows, not just that an app opens.
- Save the closure information. Keep Microsoft’s closure summary or post-incident review with your own timeline and decisions for internal learning.
After Microsoft says service is restored
Restoration of the underlying service does not necessarily make every client immediately current. Delayed messages can arrive later, calendar or file updates may take time to appear, and one client may continue to show stale cached content. Avoid assuming that a delayed message was lost or that an apparently recovered app has completed every workflow. Reconcile important transactions, meeting changes, and uploads with their recipients or owners.
Microsoft distinguishes investigation, mitigation, restoration, and closure reporting. Its service-continuity documentation says broad, noticeable incidents receive a preliminary post-incident review within 48 hours of resolution and a final report within five business days; other incidents may receive a closure summary rather than a full review. These are Microsoft’s stated reporting practices, not a guarantee that every event receives a detailed root-cause report. See Service health and continuity for the current documentation.
That same Microsoft page publishes aggregate worldwide availability figures. Such figures summarize broad service availability; they do not show that every tenant, feature, or region had identical uptime, and they are not a promise of uninterrupted service for a particular organization. Do not treat an aggregate availability figure as an individual service-level agreement or as proof of eligibility for a credit. Review the applicable service-specific terms for any contractual question.
Prepare for the next Microsoft 365 disruption
Continuity planning is about preserving essential communication and decisions, not necessarily purchasing a second complete office suite. Microsoft’s continuity guidance emphasizes multichannel incident communications rather than depending entirely on Exchange or Teams.
- Keep an offline contact list and business-continuity instructions that employees can access when Microsoft 365 is unavailable.
- Define phone or SMS escalation for urgent notifications, with clear rules for privacy and sensitive information.
- Choose an independent incident-management channel and, if critical meetings demand it, a documented secondary meeting option.
- Maintain an emergency status page or communication method that does not depend on the affected tenant.
- Document who can declare an incident, approve workarounds, and reconcile messages, files, and meeting changes after recovery.
- Test the plan periodically so employees know how to find instructions and which channels are authorized.
A higher Microsoft 365 plan should not be presented as a way to eliminate platform-wide outages. Additional plans may provide other identity, security, compliance, device-management, or support capabilities, but organizations should assess those needs separately from availability planning.
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