Here's the lowdown
Microsoft opened incident EX1550543 after users had trouble reaching Exchange Online mailboxes through multiple connection methods.
The company first described impact in the Americas, then warned that Microsoft 365 service connectivity could affect users in any region.
A separate Teams incident, TM1550488, affected North American users. Microsoft said automated recovery actions were reducing that impact.
Outlook went down in the middle of the workday
Outlook users ran into a familiar modern problem Thursday afternoon: the cloud was still there, but the inbox was not.
Outage reports began climbing around noon Eastern time. By 1:30 p.m., Downdetector had received more than 12,000 reports tied to Microsoft services.
The trouble was not limited to one version of Outlook. Microsoft said users were having problems reaching Exchange Online mailboxes through multiple connection methods, which can include web, desktop and mobile access.
Microsoft first described the impact as affecting users in the Americas. A later Microsoft 365 Status update widened the warning and said service connectivity could affect users in any region.
The company tracked the Exchange problem under incident EX1550543.
Teams had a separate problem
Microsoft Teams was also having trouble Thursday, though Microsoft tracked it as a separate incident.
The Teams issue, TM1550488, affected users in North America and could interfere with access to the app and its features. That meant some users were dealing with email, calendars, chat and meeting tools failing at the same time.
Microsoft later said automated recovery actions were reducing the Teams impact. That was a sign of progress, but it did not mean every user or every feature had recovered.
Why outages can look different for everyone
Large cloud outages rarely hit every customer in exactly the same way.
One person may be unable to open Outlook while a coworker can still send messages. A mobile app may load while the desktop version fails. Teams chat may work even when meetings or scheduling do not.
That uneven impact can make a recovery look complete before it really is. Microsoft’s status updates and incident numbers are the clearest way to follow the official scope while services return.
What happens next
Microsoft was still investigating the Exchange Online problem when the outage was reported and had not announced a full restoration time.
The key question is whether the company can restore stable access across Outlook, Exchange Online and Teams without another wave of disruptions. Until then, users may continue to see partial or inconsistent service even as the number of outage reports falls.
Ledger Lowdown will keep watching Microsoft’s status updates as the recovery continues.
