Connecting my company mailbox

Open Administration, Organization, then Organisation mail. There you connect ONE Microsoft 365 account for the whole company; the same page also lets you link a Gmail mailbox.

The Microsoft secret is tested BEFORE being written, and it is stored encrypted. It is never readable again: only its fingerprint is shown. Leaving the field blank keeps the stored secret.

The addresses that SEND are set elsewhere, per entity: Administration, Organization, then Expéditeurs e-mail (email senders). This is what lets two brands of the same company each write under their own address.

The Mailbox step of the Get started screen becomes done when an entity has an active sending address attached to the company's Microsoft 365 account.