...
https://addons.thunderbird.net/en-US/thunderbird/addon/owl-for-exchange/
https://www.beonex.com/owl/
https://gitlab.com/beonex/owl-support/wikis/home
Install and configure the Owl plugin in Thunderbird
...
...
https://addons.thunderbird.net/en-US/thunderbird/addon/owl-for-exchange/
https://www.beonex.com/owl/
https://gitlab.com/beonex/owl-support/wikis/home
...