

The idea is that by creating passwords for each individual application, one can easily revoke specific applications when one has finished using them. This is referred to as an "App password", and is more like a "token", except that it does not expire. We just need to create a specific password that only Thunderbird will use. This tutorial will show you how to resolve this so that you can still use Thunderbird as your email client for office 365. Unfortunately, it can cause integration issues when one tries to use third-party applications like Thunderbird.

Two-factor authentication (2FA), is a fantastic security mechanism that will definitely save you one day.
