Microsoft Outlook faced a significant outage lasting over 11 hours, beginning at 2220 UTC on July 9. Users were unable to access their mailboxes via any method, including Outlook.com and mobile applications. Microsoft identified issues with mailbox infrastructure and was probing for causes, suspecting authentication component problems. Updates indicated deployment of a fix was in progress, aiming for a resolution. The most optimistic update suggested a quicker resolution than expected and hoped for restoration by the next scheduled update.
The troubles began at 2220 UTC on July 9 when Microsoft confirmed that users may be unable to access their mailbox using any connection methods, including Outlook.com and Outlook Mobile.
Microsoft stated that a portion of mailbox infrastructure isn't performing as efficiently as expected and they are investigating the issue further to inform next troubleshooting steps.
At 0330 UTC on July 10, Microsoft reported that they were probing the impacted mailbox infrastructure and suspected the glitch was related to an authentication component.
The deployment of a fix is progressing quicker than anticipated, with expectations that impact will gradually mitigate, and resolution will occur by the next update.
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