Microsoft says June Outlook outages were a DDoS attack

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Microsoft Outlook was subjected to a DDoS attack. | Illustration: The Verge

In early June, complaints began cropping up on Twitter that Outlook was down for as many as 18,000 users at the peak of what, it turns out, was a Distributed Denial-of-Service (DDoS) attack, according to a story in The Associated Press (AP) this morning. Microsoft acknowledged the attack in a blog post on Friday, offering some technical details and recommendations for guarding against such attacks in the future.

The blog doesn’t mention whether the company got things under control or whether the attack abated on its own. But on Twitter, the Microsoft 365 Status account tweeted about the outage as it occurred on June 5th, then again later that day, finally seeming to get things under control the next morning:

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Posted by Experimentor