When will my Outlook calender be back?

Hello Peter,

I'm very sorry for the inconvenience this is causing, especially when you're unable to access your business appointments and need your calendar urgently.

At the moment, Outlook and other Microsoft 365 services are affected by an ongoing service incident (MO1550821), classified as Service Degradation. This incident affects services that rely on Exchange Online, including Outlook on the web and calendar functionality.

Microsoft's engineering teams are actively working to restore service, and progress is being made in addressing the issue and improving the availability of the affected infrastructure. Although an official Estimated Time of Arrival (ETA) for complete recovery is not yet available, recovery efforts are ongoing.

Since this is a business account, your organisation's IT administrator can monitor real-time updates and official timeline details in the Service Health portal: https://admin.cloud.microsoft/?source=applauncher#/servicehealth/:/alerts/MO1550821

If you aren't sure how to reach your organisation's IT administrator, you can find guidance here: How do I find my Microsoft 365 admin

I truly appreciate your patience and understanding while Microsoft works to resolve this issue.