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On July 2, 2021, at ~9:47 am UTC, Microsoft indicated that they were investigating an issue in which users were experiencing latency or were unable to access multiple Microsoft 365 services.
The incident number was MO266345.
On April 22, 2021, at ~2:55 pm UTC, Microsoft reported a potential Exchange Online mailflow incident impacting users in North America.
Many Twitter users soon chimed in stating that this "potential" issue was in fact a real issue for their organization.
On April 8, 2021 at ~8:15 pm UTC, Microsoft reported an issue that was preventing users in LATAM from accessing Microsoft 365 services and features.
Many users took to Twitter to share their frustration over the recent stream of outages, including a few major outages in recent weeks that left Microsoft 365 services down for hours. Some even joked about experiencing the feeling of deja vu.
On April 1, 2021 at ~10:43 pm UTC, Microsoft reported an issue that was preventing users from accessing the Microsoft's Azure cloud services and Microsoft 365 services. And no, unfortunately this is not an April Fools joke.
On March 31st, 2021 at ~1:45 am UTC, Microsoft reported an issue that was preventing users from accessing the Microsoft admin center.
Shortly after Microsoft's initial report, Microsoft tweeted again stating that the issue was affecting users in the United Kingdom, France, and Central United States
On March 18, 2021 at ~4:30 pm UTC, Microsoft reported an issue that was preventing users in EMEA from access Microsoft 365 services.
Users took to Twitter to express frustration with the recent string of outages over the past couple of weeks.
Throughout this post, we will be dissecting the key events of the worldwide Microsoft 365 services outage that spanned over 9 hours on March 15th 2021.
On March 15th, 2021 at 8:40 pm UTC, Microsoft reported an issues that was preventing users from accessing Microsoft 365 services. Shortly after, they confirmed that the issue could be affecting users worldwide.
On March 10, 2021 at ~9:00 am UTC, Microsoft reported an issues that was preventing users in the UK from accessing Microsoft 365 services.
Shortly after, at ~10:30 am UTC, Microsoft reported that the issue was due to a third-party network interruption and that the third-party network provider had taken corrective action to resolve the issue.
On March 2, 2021 at ~3:00 pm UTC, Microsoft reported an issue that was preventing users in Brazil from accessing Microsoft 365 services.
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On February 25, 2021 at ~3:00 pm UTC, Microsoft reported sign-in issues with Microsoft Stream.
Shortly after, Microsoft reported that the issue was affecting users out of Europe, the Middle East, and Africa regions.