Changes / Front / [office365] Office channels offline preventing emails being sent or received
Front: Major incident: [office365] Office channels offline preventing emails being sent or received
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 from the diff below (Sol; type: incident outage). Check the diff before relying on it.
What changed
Before: not present
After: [office365] Office channels offline preventing emails being sent or received
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After: major
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After: resolved
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After: 2026-05-28 18:24 UTC
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After: 2026-06-01 23:35 UTC
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After: O365
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After: We are currently investing an issue where a subset of customers are seeing offline O365 channels.
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After: We are attempting a mitigation step to get impacted channels back online.
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After: Front continues to investigate paths to restore access for affected Office365 channels. Office reports internal errors, which we are trying to work around.
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After: 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.
Before: not present
After: 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.
Before: not present
After: 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.
Before: not present
After: 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.
Before: not present
After: 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.
Before: not present
After: 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.
Before: not present
After: 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.
Before: not present
After: 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.
Before: not present
After: 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.
Before: not present
After: 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.
Before: not present
After: 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.
Before: not present
After: 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.
First version of this incident archived by Rewindex. View the live incident.
History of this incident
| When (UTC) | Change | Kind |
|---|---|---|
| Major incident: [office365] Office channels offline preventing emails being sent or received (this change) 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. | Major incident |