Microsoft 365 elevated error rates

We're seeing improvement: syncs with Microsoft are succeeding in much greater numbers.

We are processing the backlog of changes to bring calendars fully back in sync.

We are continuing to monitor for any further issues.

While we wait for the Microsoft outage to be resolved, here is what you can expect from your Cronofy operations:

- We are retrying all creation and updates to events. As Microsoft restores service, these will begin to sync into calendars as usual.
- Availability Queries still work, and are based on our best knowledge of each calendar. Calendar data from Microsoft can not be guaranteed to be up to date at the moment. However, as no one can edit their calendars at the moment, this is a low risk.
- Push Notifications for calendar changes are being sent as normal. You will be seeing lower levels now because of the lack of changes being received from Microsoft. There will be higher levels later when sync operations resume.
- Once connection is restored, Cronofy will automatically reconcile changes to events to bring the calendar back up to date. This is the same operation as when a calendar has been disconnected for a period and then reconnected.

You do not need to take any action, and no data will be lost; all changes will eventually sync as soon as we are able.

We are continuing to monitor https://status.cloud.microsoft/ and our own telemetry, and will update again once we see normal operations resuming.

We are still monitoring, waiting for Microsoft to restore service fully.

We are going to stop posting updates for now, until we see the incident resolved. Our service will continue to sync as much as possible, and retry any changes that failed.

Please watch https://status.cloud.microsoft/ for updates from Microsoft on the resolution of the incident.

We have still seen no improvement yet.

Sync of Microsoft calendars remains degraded - about 40% of our communications to Microsoft are working, and any failed calls are being retried until they succeed.

Microsoft are reporting under issue reference EX1550543, which you can follow at https://status.cloud.microsoft

We will update this status when we see some improvement or in another 2 hours.

We are continuing to monitor the situation but have seen no improvement yet.

Microsoft are reporting under issue reference EX1550543, which you can follow at https://status.cloud.microsoft

We will update this status when we see some improvement or in 2 hours.

We are continuing to monitor the situation.

Sync to Microsoft 365 calendars is degraded, so there is some delay between events appearing in calendars. Other providers are not impacted.

We will update this status when we see some improvement, or in an hour.

This looks to be as a result of a wider outage with Microsoft's services that has been given issue reference EX1550543.
We'll continue to monitor.

We are observing Microsoft 365 calendar APIs returning higher error rates and investigating the impact. This may affect how quickly changes to calendars are observed and our ability to push events.