Microsoft is underway investigating if they were breached due to a claim from a cyberthreat group has released. The same extortion group that has also claimed recent breaches to six other large businesses.
Bleeping Computer – “Microsoft investigating claims of hacked source code repositories” : https://www.bleepingcomputer.com/news/security/microsoft-investigating-claims-of-hacked-source-code-repositories/
Cybersecurity Today 