The Microsoft threat research team scanned all Microsoft user accounts and found that 44 million users were employing usernames and passwords that leaked online following security breaches at other online services. From a report: The scan took place between January and March 2019. Microsoft said it scanned user accounts using a database of over three billion leaked credentials, which it obtained from multiple sources, such as law enforcement and public databases. The scan effectively helped Microsoft identify users who reused the same usernames and passwords across different online accounts. The 44 million total included Microsoft Services Accounts (regular user accounts), but also Azure AD accounts.
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https://tech.slashdot.org/story/19/12/05/1914219/44-million-microsoft-users-reused-passwords-in-the-first-three-months-of-2019?utm_source=rss1.0mainlinkanon&utm_medium=feed