https://www.bleepingcomputer.com/news/microsoft/microsoft-solarwinds-hackers-downloaded-some-azure-exchange-source-code/

Microsoft announced today that the SolarWinds hackers gained access to source code for a limited number of Azure, Intune, and Exchange components.

In December, it was disclosed that the SolarWinds' network management company suffered a sophisticated cyberattack that allowed hackers to create a supply chain attack targeting the company's customers.