Microsoft
ran a password-reuse analysis on over three billion company accounts in 2019 to find out how many of the used password were in use by Microsoft customers.
The company collected password hash information from public sources and received additional data from law enforcement agencies, and used the data as a base for the comparison.
An analysis of password use in 2016 revealed that about 20% of Internet users were reusing passwords, and that an additional 27% were using passwords that were "nearly identical" to other account passwords. In 2018, it was revealed that a large part of Internet users were still
favoring weak passwords over secure ones.