Microsoft Outlook Outage Appears Mostly Resolved - CNET

摘要: Microsoft Outlook Outage Appears Mostly Resolved

Outlook users faced a frustrating start to the work week thanks to an issue with Microsoft Exchange

正文

Microsoft Outlook Outage Appears Mostly Resolved

Outlook users faced a frustrating start to the work week thanks to an issue with Microsoft Exchange Online.

Gael Cooper

Macy Meyer

Reporter II

September 1, 2026, 4:16 pm ET

4 min read

Microsoft Outlook users faced an outage on Monday.

SOPA Images/Getty Images

To the dismay of workers everywhere (wink, wink), Microsoft Outlook kicked off the work week with a major outage that left thousands unable to use the email service.

Downdetector, which tracks outages and problems for online platforms,

showed a large spike

in reports of problems with Outlook starting around 8 a.m. PT on Monday, peaking at more than 6,000 reports at 8:17 a.m. Now, the issue appears to be mostly resolved, as Downdetector shows fewer than 550 reports at 6 a.m. PT on Tuesday.

A Microsoft representative told CNET the company is looking into the reports.

Sep 1, 2026 3:56 PM ET

Downdetector received more than 130,000 reports of Outlook problems

Gael Cooper

Microsoft Outlook had a bad day on Monday, thanks to problems with Microsoft Exchange Online, which Outlook uses for mailbox access and email delivery. On Tuesday, some people were still reporting issues.

A Microsoft representative did not immediately respond to a request for comment.

The site Downdetector

tracked reports of Outlook problems

on Monday and Tuesday.

“Report volume spiked hard from around 11.20 a.m. ET, running to well over 130,000 user reports across the day, against a normal Monday total in the low thousands, so this was roughly two orders of magnitude above baseline,” Luke Kehoe, lead industry analyst for Downdetector parent group Ookla, told CNET in an email on Tuesday.

“The bulk of (the error reports) landed in the first few hours and stayed elevated through the evening before tailing off overnight,” Kehoe said. “Reports were spread fairly evenly across receiving mail, sending mail, login and the app and website, which points to a broad backend issue rather th

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