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The outage is blocking business, government, and consumer email worldwide, and sources link it to Azure network configuration changes as access slowly returns.
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This brief comes from Tech Twitter’s edited headlines. The posts below are the sources grouped with the story; statements in them belong to their authors.
Microsoft’s Exchange / Outlook outage has been ongoing for more than 12 hours. It’s impacting email worldwide for businesses, governments, and consumers. Engineers are struggling to bring servers back up due to a complex series of failures. Postmortem will be an interesting readRead original on X
Microsoft Outlook is down. Microsoft 365 issues are cutting people off from their email, as well as Microsoft Teams, SharePoint Online, and Microsoft 365 CopilotRead original on X
I am hearing that Microsoft's Outlook outage is down to some kind of rollout that caused servers to spike CPU usage, causing racks to go into maintenance mode and creating cascading failuresRead original on X
Holy cow, there’s a massive Microsoft outage going on. Outlook .com is down, globally, as I understand. Microsoft employees cannot send/receive email as well (plus everyone else using M365) This is very bad given how important email is for comms Postmortem will interestingRead original on X
Outlook has been broken for most of a workday, and Microsoft can't just switch it back on. Every phone and laptop that's been retrying email since this morning would hit the servers in the same second and knock them right back over. That's pretty much how it broke in the first place. Every Exchange server gets watched by an automated health check, and if it fails, it gets yanked out of rotation so nobody's email lands on a broken machine. With one bad server, that's great design. Today a core process on a whole bunch of them started choking at once (Tom Warren reports a rollout spiked CPU and pushed racks into maintenance mode), and Microsoft's own update says servers were failing those health checks and dropping out. So follow one person's inbox. Their server gets pulled, but their…Read original on X
Madness - 12 hours into the outage. Microsoft is posting regular updates but they have not figured out what is causing servers to die when brought back online From their updates it sounds like it’s a thundering herd + some other weird issue they’ve yet to pinpointRead original on X
What a day to hit up MSFT HQ for the first time. I didn’t know Outlook had an outage when posting this, and definitely not that it would be the largest-ever email-related outage since 1997 (when a reply-all outage took down Microsoft’s internal email for ~2 days.)Read original on X
Microsoft appears to be making some progress with its huge Exchange / Outlook outage. Mailbox access is gradually coming back online for some customers. Sources tell me the outage has been linked to Azure VNet config changesRead original on X
even during the biggest microsoft outage of all time, teams persistsRead original on X
Microsoft's Exchange and Outlook email outage runs over 12 hours
Microsoft Outlook outage lasts over 12 hours, linked to Azure changes
Microsoft Exchange and Outlook outage lasts over 12 hours
Microsoft Outlook and Exchange outage runs more than 12 hours worldwide
Microsoft Outlook email outage lasts over 12 hours, largest since 1997
Microsoft Outlook and Exchange outage stretches past 12 hours worldwide
Microsoft Outlook outage stretches past a workday as servers fail on restart
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