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Microsoft 365 Suffers Massive Two Day Outage, Outlook and Exchange Down


The Microsoft 365 online productivity suite experienced multiple outage issues throughout the last two days, with users reporting that they couldn’t access their mailboxes through multiple protocols.

Furthermore, some user reports also mentioned slow e-mail sending and receiving (with more than 3-hour delays), missing e-mails, as well as sending or receiving multiple repeated e-mails at one time.

Microsoft 365 is a software offering that bundles Office 365, Windows 10, and EMS (short for Enterprise Mobility + Security), which in Microsoft’s vision provides customers with an easy way of enjoying a secure and easy to manage online productivity platform.

Being an online platform comes with its downsides, one of them being the fact that issues affecting one of the services offered as a cloud product will be experienced by all customers.

On January 24 at 1:53 AM, the official Microsoft Twitter account which delivers updates on Microsoft 365 service incidents tweeted the following:

After four hours of investigating the Microsoft 365 outage, Redmond tweeted at 5:54 AM that:

While Microsoft continued analyzing the time out issues reported in the tweet above and trying to mitigate them, hundreds of users from all over the world (most of them from Europe) continued reporting outages that prevented them sending and accessing their personal and corporate e-mails for almost the entire work day.

Outage Map
Microsoft 365 outage map (Source: Downdetector)

Microsoft followed up stating that “We’ve determined that there is higher than expected queuing within the authentication infrastructure, which may be the cause of impact. We’re working to identify the cause of these queues and determine steps to remediate impact.”

This status update issued through the admin center was followed on January 25 at 1:48 AM by a tweet also mentioning Exchange outage issues:

After two days of downtime, multiple Microsoft 365 users said that the EX172491 issue is now removed altogether by Microsoft from the admin center.

internetnewsblog contacted Microsoft asking for further details regarding the Microsoft 365 outage but did not receive an answer by the time this article was published.

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