What Caused The Massive Microsoft Teams, Office 365 Outage Yesterday? Here’s What We Know

Cloud-based Microsoft applications, including Microsoft Teams, went down across a swathe of the U.S. yesterday.

Users of Microsoft Office 365, Outlook, Exchange, Sharepoint, OneDrive and Azure also reported they were unable to login. Instead, they were presented with a “transient error” message informing them there was a problem signing them in.

These issues appear to have started at around 5 p.m. ET, with services not returning to normal for many until 10 p.m. ET.

Indicative of the times we live in, whenever such an outage impacts so many people, the question of whether it’s an ongoing cyber-attack is front and center.

However, there is no evidence this was the case last night. So what did happen to take down access to Microsoft Teams, with work from home users taking to Twitter to complain of

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