Microsoft 365 calendars are not syncing

Update timeline

1. identified Nov 12, 2026, 05:30 PM UTC

   Microsoft is having an outage in Exchange Online, the service behind Outlook calendars. Since 11:30 AM CT, most of our requests to Microsoft 365 have failed. Calendars connected through Microsoft 365 are not syncing, and calendar views in Decision Site may not load for those users. Google calendars and the rest of Decision Site are working normally. Microsoft has acknowledged the outage. Your Microsoft 365 administrator can follow Microsoft's updates in the Microsoft 365 admin center under Service health. We are retrying automatically and will catch up on missed calendar changes once Microsoft recovers. You don't need to reconnect your calendar.

2. identified Nov 12, 2026, 07:33 PM UTC

   Microsoft has confirmed a wider Microsoft 365 outage that also affects Exchange Online, Teams and SharePoint. Their latest update says a large number of their servers became unavailable, and they are working to bring them back. You can follow Microsoft's updates at , and their next update is due by 4:00 PM CT. Microsoft 365 calendars will not sync until Microsoft recovers, and we will catch up on missed changes automatically after that.