Microsoft 365 down

There are strong signs of a widespread Outlook/Microsoft 365 mail incident today, but no reliable restoration time is publicly confirmed; the authoritative estimate will appear in Microsoft’s service-health channel.

Check the applicable status channel

• Work or school Microsoft 365 account: Ask your Microsoft 365 administrator to open Microsoft 365 admin center → Health → Service health and review the active Exchange Online or Outlook incident. Microsoft identifies this as the source for up-to-date organizational service status.^1^
• Personal Outlook.com/Hotmail account: Check Microsoft’s public Service Health Status page. Microsoft directs Outlook.com users there for access incidents.^2^

Current user reports show problems with both Outlook and Microsoft 365, especially Exchange-related mail functionality.^3^^4^ Downdetector is a non-Microsoft reporting site, so use it to assess scope—not as the authoritative source for an ETA.

If mail fails in Outlook desktop, mobile, and the web simultaneously, avoid reinstalling Outlook, deleting profiles, or repeatedly changing passwords while an active service incident is listed. Service-side recovery should occur without client changes. After Microsoft marks the incident resolved, allow time for queued messages to process; if only one device remains affected afterward, then troubleshoot that client separately.

References

1. Fixes or workarounds for recent Office issues | Microsoft Support
2. Fixes or workarounds for recent issues on Outlook.com | Microsoft Support
3. Microsoft Outlook down? Current problems and outages | US
4. Microsoft 365 down? Current problems and outages | US