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Microsoft says Russian hackers accessed more than initially reported

Microsoft said Thursday that suspected Russian hackers who targeted federal agencies and U.S. companies accessed more of its systems than previously believed.

The company revealed that the hackers managed to look at Microsoft source code through an employee account, although they were unable to access emails or Microsoft products and services. "Our investigation into our own environment has found no evidence of access to production services or customer data," Microsoft said in a blog post. "The investigation, which is ongoing, has also found no indications that our systems were used to attack others."

The cyberattack began as far back as October 2019, when the hackers breached systems at SolarWinds, a technology monitoring company used by government agencies and most Fortune 500 companies.