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

- Impact (vendor’s label): major
- Status: resolved
- Started: 2026-05-28 18:24 UTC · Resolved: 2026-06-01 23:35 UTC · Duration: 4 d
- Updates: 15 · Affected components: O365
- [Vendor status page: https://stspg.io/8dkmff418pg3](https://stspg.io/8dkmff418pg3)
- [Company: Front](https://rewindex.com/company/front.md)

## Summary

Front reported a major O365 outage affecting a subset of customers, with offline channels preventing email sending or receiving. It started at 2026-05-28 18:24 UTC and was resolved at 2026-06-01 23:35 UTC, lasting 4 days 5 h. Front added automatic channel recovery while continuing to investigate remaining sync failures with Microsoft. _(machine-written, sol)_
## Timeline of updates

- **investigating** 2026-05-28 18:24 UTC: We are currently investing an issue where a subset of customers are seeing offline O365 channels.
- **identified** 2026-05-28 18:57 UTC: We are attempting a mitigation step to get impacted channels back online.
- **identified** 2026-05-28 19:35 UTC: Front continues to investigate paths to restore access for affected Office365 channels. Office reports internal errors, which we are trying to work around.
- **identified** 2026-05-28 23:36 UTC: 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 support@front.com for assistance.
- **identified** 2026-05-29 02:05 UTC: 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 support@front.com for assistance.
- **identified** 2026-05-29 10:42 UTC: 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 support@front.com for assistance.
- **identified** 2026-05-29 18:38 UTC: 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 support@front.com for assistance.
- **identified** 2026-05-29 23:40 UTC: 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 support@front.com for assistance.
- **identified** 2026-05-30 03:37 UTC: 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 support@front.com for assistance.
- **identified** 2026-05-30 16:04 UTC: 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 support@front.com for assistance.
- **identified** 2026-05-31 03:17 UTC: 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 support@front.com for assistance.
- **identified** 2026-05-31 15:22 UTC: 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 support@front.com for assistance.
- **identified** 2026-06-01 02:57 UTC: 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 support@front.com for assistance.
- **identified** 2026-06-01 15:30 UTC: 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 support@front.com for assistance.
- **resolved** 2026-06-01 23:35 UTC: 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.

## Rewindex changes for this incident

- 2026-05-28 18:24 UTC: [Major incident: \[office365\] Office channels offline preventing emails being sent or received](https://rewindex.com/change/i59cb770dc79fa8.md)


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Canonical: https://rewindex.com/company/front/incidents/qmjxmmqfk21f · Markdown: https://rewindex.com/company/front/incidents/qmjxmmqfk21f.md · JSON: https://rewindex.com/api/v1/companies/front/incidents/qmjxmmqfk21f · Generated 2026-10-18T09:40:51.211Z