[@Guido76] The software is in English yes, but it does work with Office in French.
As for Outlook, the software is using your default messaging application. See here how to change your default: https://www.groovypost.com/howto/change-default-email-app-windows-10-mailto/#:~:text=Change%20Windows%2010%20Default%20Email%20App&text=To%20set%20your%20favorite%20email,the%20default%20from%20the%20list.