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Microsoft has reported this issue should be resolved.
We are currently monitoring an issue affecting Microsoft 365 Email/Calendar Sync. This is due to a widespread Microsoft 365 service outage. You can track the official status updates here: https://status.cloud.microsoft/m365/
With IsDown, you can monitor all your critical services' official status pages from one centralized dashboard and receive instant alerts the moment an outage is detected. Say goodbye to constantly checking multiple sites for updates and stay ahead of outages with IsDown.
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