President of Microsoft Brad Smith confirmed in a blog that the company had indeed been breached as a result of the SolarWinds hack. Here, he speaks onstage during the 2018 Concordia Annual Summit - Day 1 at Grand Hyatt New York on September 24, 2018 in New York City. (Riccardo Savi/Getty Images for Concordia Summit)

In a blog post Thursday, Microsoft President Brad Smith announced it had notified more than 40 customers of breaches due to the SolarWinds hack based on telemetry from its Defender antivirus, and argued for several policy solutions.

Later that day, the company confirmed it too had been affected by the SolarWinds fiasco, but clarified that neither customer data nor production systems showed evidence of being invaded.

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