Bonjour,

que se passe-t-il quand tu lances Thunderbird ? Un message d'erreur? Au démarrage de Thunderbird vois-tu une page comme dans ma copie d'écran, avec une invitation de "configurer votre adresse e-mail existante" ?

Yes, it is attempting to assist you in that. You need to have already secured an email account and thunderbird will assist in entering the proper information for server and security options. I notice you have a gmail account. Enter your name, the email address, do NOT enter the password and that will be sufficient for thunderbird (usually) to set up the account. Since Gmail also requires that thunderbird accept cookes, check in settings>privacy&security that cookies are accepted. Or, just enter the email info and press enter key. Reminder: do not enter password until you get a Google popup that asks for it. Let us know if you have problems.

Je suis bloqué, on me demande un mot de passe, le seul que j'ai c'est celui de Google, ça ne marche pas, je tourne en rond

Je peux cependant lire mes messages sur gmail, seul Thunderbird ne fonctionne pas.

Yes, it is attempting to assist you in that.

david, note that Michel already has an account which has disappeared after an unfortunate manipulation!

Let's start over. - check that cookies are accepted at settings>privacy&security - at menu to create account, enter just email address in full and name and UNtick the save password box. Then, press CONTINUE. Does this produce an error? If not, click DONE. - the Google prompt should now appear. What happens here?