Outlook Outage Checklist: What Still Works Offline

This Outlook outage checklist shows how to confirm Microsoft 365 is still degraded, use mail already stored on your computer, and move live chat off Exchange without opening account settings. Euronews reported the failure began on Thursday 12 November 2026, and Outlook was still intermittent into Friday even where Microsoft described recovery. It matters now because the failure is Exchange Online access, not a setting on your PC.

Updated November 13, 2026

What should an Outlook outage checklist start with?

Confirm the incident on Microsoft’s pages before you troubleshoot the PC. Euronews reported updates on X at @MSFT365Status and a status page at status.cloud.microsoft. CNN said the company is also posting on its service health status page.

Downdetector counts complaints, not a fix. CNN reported a peak of 130,000 Outlook reports, which it said understated the scope.

Microsoft, quoted by Tom’s Guide:

Some users may still experience intermittent access issues or delayed email delivery as mitigation continues across remaining affected infrastructure.

Microsoft also said the extended 48-hour email timeout window remains in place to help protect delayed messages as delivery catches up, Tom’s Guide reported. The Guardian reported that by Friday morning most trouble had narrowed to Exchange, while Teams meetings and chats had returned and access stayed patchy.

How do you work offline without changing account settings?

Leave Account Settings closed. Microsoft’s support page says Cached Exchange Mode is the default for a Microsoft 365 or Exchange account, and it keeps a mailbox copy on the computer when the network is slow or unavailable. By default, 12 months of email is available offline. It does not work with POP or IMAP, and it is not available in new Outlook for Windows.

Euronews says cached mode lets you work with mailbox items even if the connection is unavailable. Use Work Offline on the Send/Receive tab in Outlook for Microsoft 365 and in the 2021, 2019 and 2016 versions.

1. Check status.cloud.microsoft and @MSFT365Status before retrying Send.
2. Leave Account Settings closed and use the local copy if Cached Exchange Mode is already on.
3. Select Work Offline on the Send/Receive tab in the Outlook versions listed above.
4. On new Outlook for Windows, or on POP or IMAP, skip cached mail and use another channel.
5. Coordinate on Slack or Google Chat, and share large files through WeTransfer or Google Drive.

What should you not reinstall while Exchange is overloaded?

Do not reinstall Outlook, and do not expect the web app or the phone app to open a mailbox the desktop cannot reach. Euronews said moving between apps may not help, because Exchange Online access failed across connection methods.

The Guardian reported that Microsoft indicated a configuration update overloaded some servers and took them offline. When traffic returned, those servers became unresponsive again, so Microsoft limited traffic and rolled some back to an earlier configuration. CNN quoted an update that “the servers we returned to service can become unresponsive again once they receive traffic.” A reinstall does not change that load, and Microsoft said there is no evidence of malicious activity.

Which fallback channels avoid Microsoft 365?

Use a channel that does not sit on Exchange. Euronews points to Slack or Google Chat, plus WeTransfer or Google Drive when a file is too large for chat.

CNN reported that Australian schools texted parents to phone in absences, and that some local governments told people to call instead of email. The Guardian reported a French municipality told residents to phone, and that a Japanese company handled orders by phone, while Australian schools lost inbox access. An existing Gmail inbox is outside this failure. Mark Gregory of RMIT said companies should keep a backup such as Gmail, The Guardian reported. Analysis: that backup will not open Exchange, and cached mail is not proof a new message can send.