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Millions of office workers received an unexpected pause from email Thursday when a Microsoft outage disrupted Outlook and other workplace applications around the world. The interruption also sidelined popular artificial intelligence tools that rely on Microsoft’s systems.

The outage began around midday Thursday, and Downdetector recorded reports from 74 countries within roughly an hour. By Friday, Microsoft said it was seeing “encouraging recovery progress.”

The damage extended beyond Outlook. Microsoft Copilot could not reach users’ email, calendars, or files, while Microsoft connectors used by OpenAI’s ChatGPT and Anthropic’s Claude also stopped working.

The scale of Microsoft’s customer base magnified the disruption. The company says more than 430 million people use its Microsoft 365 applications, placing its services at the center of daily workplace activity.

Despite the interruption, users’ email was not lost. Microsoft extended its email timeout to 48 hours, allowing messages to continue trying to reach recipients rather than bouncing back to their senders.

Customers also had little they could do to solve the underlying problem. Resetting a password or reinstalling Outlook would not help, although the desktop version of Outlook could still display messages that it had previously downloaded.

Companies that pay for Microsoft 365 may be entitled to credits. Microsoft promises 99.9% uptime, equal to about 43 minutes of downtime each month, and offers credits ranging from 25% to 100% of the monthly fee when service falls short.

Those credits are not automatic. A customer’s information technology department must submit a claim, leaving businesses to seek compensation after dealing with the operational damage caused by the outage.

Microsoft’s deeply embedded position in workplace software also makes it difficult for customers to walk away. Pershing Square CEO Bill Ackman, whose fund owns Microsoft stock, discussed that advantage Thursday at Yahoo Finance Invest.

Ackman called Microsoft “the gateway to how people interact with the basic workflows of a desk worker,” adding that this creates “a much more difficult position to dislodge.” That durability is typically favorable for Microsoft shareholders, even when outages reveal the risks of concentrated dependence.

The latest failure was not an isolated disruption. Microsoft has blamed its own changes or maintenance for Microsoft 365 problems during at least six months this year, including a nearly 10 hour January outage and a spam filter update that rejected legitimate email earlier this month.

Australia’s home affairs minister, Tony Burke, said Microsoft believed it was confronting “an update that has gone awry,” comparing the situation with the 2024 CrowdStrike meltdown. Microsoft initially turned to a familiar technical response by restarting affected servers.

That effort failed to hold. Servers returned to service but went down again after traffic resumed, showing that a restart alone would not resolve the underlying issue.

On Friday, Microsoft traced the outage to a problem connected with “an earlier network capacity upgrade” that emerged following a recent network change. The company said it was “deeply sorry for the disruption.”

The breakdown arrived as Microsoft reduced its workforce while committing substantial resources to artificial intelligence. The company offered buyouts to about 60,000 employees in October, with workers who accept scheduled to depart on Dec. 31.

CEO Satya Nadella said last year that artificial intelligence produces “maybe 20%, 30%” of Microsoft’s code. Microsoft nevertheless rejected the idea that artificial intelligence caused the outage, calling it “a technical issue not related to cyber or AI / agents” in a post on X.

Charles Lamanna, Microsoft’s executive vice president for Copilot, Agents and Platform, said the company regretted “the impact these outages had on those who depend on us.” He added that “our teams are reviewing what happened and how we can prevent similar issues going forward,” but did not address questions about staffing.

For businesses, the incident delivered a blunt warning about relying heavily on one provider. Tematica Research chief investment officer Chris Versace said, “The outage and how it hobbled many businesses and other enterprises is a reminder about the need for redundancies.”

DISCLAIMER: GoldInvestors.news is not a registered investment, legal or tax advisor or broker/dealer. All investment/financial opinions expressed by GoldInvestors.news are from the personal research and experience of the owner of the site and are intended as educational material. Although best efforts are made to ensure that all information is accurate and up to date, occasionally unintended errors and misprints may occur.