Major incident

Front: [office365] Office channels offline preventing emails being sent or received

Affected: O365

Current status of Front: Operational — live Front status

Timeline

1. May 28, 2026, 18:24 UTC
   investigating
   We are currently investing an issue where a subset of customers are seeing offline O365 channels.
2. May 28, 2026, 18:57 UTC
   identified
   We are attempting a mitigation step to get impacted channels back online.
3. May 28, 2026, 19:35 UTC
   identified
   Front continues to investigate paths to restore access for affected Office365 channels. Office reports internal errors, which we are trying to work around.
4. May 28, 2026, 23:36 UTC
   identified
   Front is partnering with Microsoft to investigate the channel sync failures and will continue to update here as we make progress. Manually re-authorizing the channel in Front's channel settings has worked in some cases, but not all. Please contact [email protected] for assistance.
5. May 29, 2026, 02:05 UTC
   identified
   Front is continuing to partner with Microsoft to investigate the channel sync failures. The next update will be within the next 8 hours. Manually re-authorizing the channel in Front's channel settings has worked in some cases, but not all. Please contact [email protected] for assistance.
6. May 29, 2026, 10:42 UTC
   identified
   Front is continuing to partner with Microsoft to investigate the channel sync failures. The next update will be within the next 6 hours. Manually re-authorizing the channel in Front's channel settings has worked in some cases, but not all. Please contact [email protected] for assistance.
7. May 29, 2026, 18:38 UTC
   identified
   Front is continuing to partner with Microsoft to investigate the channel sync failures. The next update will be within the next 6 hours. Manually re-authorizing the channel in Front's channel settings has worked in some cases, but not all. Please contact [email protected] for assistance.
8. May 29, 2026, 23:40 UTC
   identified
   Front is continuing to partner with Microsoft to investigate the channel sync failures. The next update will be within the next 6 hours. Manually re-authorizing the channel in Front's channel settings has worked in some cases, but not all. Please contact [email protected] for assistance.
9. May 30, 2026, 03:37 UTC
   identified
   Front is continuing to partner with Microsoft to investigate the decreasing volume of channel sync failures. The next update will be within the next 12 hours. Manually re-authorizing the channel in Front's channel settings has worked in most cases, but not all. Please contact [email protected] for assistance.
10. May 30, 2026, 16:04 UTC
    identified
    Front is continuing to partner with Microsoft to investigate the decreasing volume of channel sync failures. The next update will be within the next 12 hours. Manually re-authorizing the channel in Front's channel settings has worked in most cases, but not all. Please contact [email protected] for assistance.
11. May 31, 2026, 03:17 UTC
    identified
    Front is continuing to partner with Microsoft to investigate the channel sync failures. The next update will be within the next 12 hours. Manually re-authorizing the channel in Front's channel settings has worked in most cases, but not all. Please contact [email protected] for assistance.
12. May 31, 2026, 15:22 UTC
    identified
    Front is continuing to partner with Microsoft to investigate the channel sync failures. The next update will be within the next 12 hours. Manually re-authorizing the channel in Front's channel settings has worked in most cases, but not all. Please contact [email protected] for assistance.
13. Jun 1, 2026, 02:57 UTC
    identified
    Front is continuing to partner with Microsoft to investigate the channel sync failures. The next update will be within the next 12 hours. Manually re-authorizing the channel in Front's channel settings has worked in majority of cases, but not all. Please contact [email protected] for assistance.
14. Jun 1, 2026, 15:30 UTC
    identified
    Front is continuing to partner with Microsoft to investigate the channel sync failures. The next update will be within the next 12 hours. Manually re-authorizing the channel in Front's channel settings has worked in majority of cases, but not all. Please contact [email protected] for assistance.
15. Jun 1, 2026, 23:35 UTC
    resolved
    Front is continuing to partner with Microsoft on root cause of remaining channel sync failures. We added the ability to automatically bring these channels back online to prevent further customer impact.

Updates as published by Front (original).