Microsoft 365 and Office | Other
Miscellaneous topics that do not fit into specific categories.
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Outlook 365 is not opening and Outlook personal account is not updating since Sunday
Miscellaneous topics that do not fit into specific categories.
Other users are reporting the same issue, which could be a server-side error. There is currently an Exchange error, and multiple users are also reporting Outlook outages.
https://status.cloud.microsoft/
You can check the status under "Exchange Online".