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• Former employee Andrew Harris says the software giant dismissed his warnings about a critical flaw because it feared losing government business. Russian hackers later used the weakness to breach the National Nuclear Security Administration, among others.

• Harris said he pleaded with the company for several years to address the flaw in the product. But at every turn, Microsoft dismissed his warnings, telling him they would work on a long-term alternative — leaving cloud services around the globe vulnerable to attack in the meantime.

• He scrambled to alert some of the company’s most sensitive customers about the threat and personally oversaw the fix for the New York Police Department. Frustrated by Microsoft’s inaction, he left the company in August 2020.

• Within months, his fears became reality. U.S. officials confirmed reports that a state-sponsored team of Russian hackers had carried out SolarWinds, one of the largest cyberattacks in U.S. history. They used the flaw Harris had identified to vacuum up sensitive data from a number of federal agencies, including the National Nuclear Security Administration, which maintains the United States’ nuclear weapons stockpile, and the National Institutes of Health, which at the time was engaged in COVID-19 research and vaccine distribution.

• The Russians also used the weakness to compromise dozens of email accounts in the Treasury Department, including those of its highest-ranking officials. One federal official described the breach as “an espionage campaign designed for long-term data collection".

• From the moment the hack surfaced, Microsoft insisted it was blameless. Microsoft President Brad Smith assured Congress in 2021 that “there was no vulnerability in any Microsoft product or service that was exploited” in SolarWinds.

• The Microsoft manager also said customers could have done more to protect themselves.

• Harris said they were never given the chance. "The decisions are not based on what’s best for Microsoft’s customers but on what’s best for Microsoft,” he said.

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