Microsoft’s security team said today it has formally completed its investigation into its SolarWinds-related breach and found no evidence that hackers abused its internal systems or official products to pivot and attack end-users and business customers. The OS maker began investigating the breach in mid-December after it was discovered that Russian-linked hackers breached software vendor SolarWinds and inserted malware inside the Orion IT monitoring platform, a product that Microsoft had also deployed internally.

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