All Systems Operational
API Operational
Background Processing Operational
Web App Operational
Major Calendar Providers Operational
Apple Operational
Google Operational
Outlook.com Operational
Office 365 Operational
Operational
Degraded Performance
Partial Outage
Major Outage
Maintenance
API uptime
Fetching
Web App uptime
Fetching
Past Incidents
Jan 25, 2021

No incidents reported today.

Jan 24, 2021

No incidents reported.

Jan 23, 2021

No incidents reported.

Jan 22, 2021

No incidents reported.

Jan 21, 2021

No incidents reported.

Jan 20, 2021

No incidents reported.

Jan 19, 2021

No incidents reported.

Jan 18, 2021

No incidents reported.

Jan 17, 2021

No incidents reported.

Jan 16, 2021

No incidents reported.

Jan 15, 2021
Resolved - This incident has been resolved.
Jan 15, 02:58 GMT
Update - Errors for 365 calendars have been around normal levels for approximately 20 minutes.

This Twitter thread contains some details of MO234433 and related EX234428 which appear to be the root cause: https://twitter.com/MSFT365Status/status/1349884557747695618

We will look to reinstate credentials where possible shortly.
Jan 15, 02:42 GMT
Monitoring - Errors for 365 calendars remain higher, but otherwise systems have returned to normal.

A small number of accounts (less that 1%) may have been incorrectly flagged as disconnected during this period. Once 365 errors have returned to normal levels we will attempt to reinstate credentials that have been flagged during this time.

Microsoft have opened MO234433 "Unable to access multiple Microsoft 365 apps or services" which is potentially related to the errors we have observed.
Jan 15, 02:22 GMT
Update - The error rate when communicating with 365 calendars from our US data center has reduced significantly and overall background processing has returned to normal, though errors for 365 calendars remain higher than normal.

Microsoft have opened MO234433 "Unable to access multiple Microsoft 365 apps or services" which is potentially related to the errors we have observed.
Jan 15, 01:27 GMT
Identified - We are still seeing a high rate of errors when communicating with Microsoft 365 calendars. This is affecting all calls, not just push notification registration as previously reported.

Service may be returning to normal. We are continuing to monitor and take mitigating actions where possible.
Jan 15, 01:18 GMT
Update - We are seeing a high rate of errors when registering push notifications for 365 hosted calendars from our US data center.

These requests are timing out or being refused with "service unavailable" responses. We have taken steps to mitigate the effects of this on background processing.
Jan 15, 01:01 GMT
Investigating - We are currently investigating this issue.
Jan 15, 00:40 GMT
Jan 14, 2021

No incidents reported.

Jan 13, 2021

No incidents reported.

Jan 12, 2021

No incidents reported.

Jan 11, 2021

No incidents reported.