When you attempt to retrieve mail in an account, Thunderbird sends the stored password to the server. If you receive a message that the password is wrong, Thunderbird cannot assist, as it has only the password you initially provided. You can access that password by going to settings>privacy&security, and clicking 'saved passwords' and then 'show passwords', but that password is not working. You may need to contact your email host for a new password.

If you don't communicate well in English, please use geckozone - http://forums.mozfr.org/viewforum.php?f=4

Si vous n'avez pas bien communiquer en anglais, s'il vous plaît utiliser geckozone - http://forums.mozfr.org/viewforum.php?f=4