I searched the Internet for information about the dangers of communication via Microsoft Teams, and as it turned out, scammers have long been using it for their fraudulent schemes.

https://www.makeuseof.com/microsoft-teams-phishing-scams/

With such an amount, the owner should have stopped all communication via that device, at least for the sake of his privacy. However, he not only kept huge amounts on the computer but also allowed them to be stolen literally from under his nose. Sometimes quite strange questions arise: how do such people manage to get such a sum if they are so careless about storing it?