Exchange Online Service Outage
On 31 Aug, BleepingComputer reported that a Microsoft Exchange Online outage was causing email failures and authentication issues. By 04 Sep, users faced email delays and “Server busy” errors. BleepingComputer also reported that Microsoft attributed sign-in failures to an Outlook.com outage, was working to fix an Exchange Online mailbox quarantine issue, and confirmed an outage affecting search in Microsoft 365 apps. A separate Microsoft 365 outage affected Teams, SharePoint and other services. The latest dated signal shows that Exchange Online users still face delayed mail and busy-server errors.
Assuming the report is factual, impact is 0%. The event remains classified as background despite the operational disruptions affecting Exchange Online, Outlook.com, Microsoft 365 search, Teams and SharePoint.
Watch for Microsoft service updates on restoration timing and whether the email delays, authentication failures and “Server busy” errors have cleared. Further reporting may establish whether the other Microsoft 365 problems share the same cause.
Microsoft is investigating an ongoing Outlook.com outage that is causing intermittent signing issues and preventing customers from accessing their mailboxes. [...]
Microsoft is working to resolve an ongoing Exchange Online issue that has been mistakenly quarantining customers' mailboxes since Sunday. [...]
Microsoft has confirmed that this month's Windows Server security updates are causing OWA sign-in and mail delivery issues on some Exchange Server systems. [...]
Microsoft says some users are experiencing issues searching in Microsoft 365 apps, including Outlook on the web, Outlook desktop, SharePoint Online, and OneDrive. [...]
Microsoft Teams and several Microsoft 365 services are experiencing an ongoing outage, with users reporting problems accessing Teams, SharePoint, Excel and the Microsoft 365 Admin
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