I've set up my Outlook account correctly and I've been enjoying using Thunderbird for the past few days. Today, however, the email client stopped working. Right before I send out an email with my Outlook account, Thunderbird started asking for my password; and even though I put in the correct password, Thunderbird kept saying the password is wrong. I did not change any password or settings for this email account prior to this. I've then reset my email password and deleted my email account in Thunderbird, hoping that a "reset" could resolve the issue; yet it's now giving me the error "Unable to log in at server. Probably wrong configuration, username or password". I set up the configuration exactly as my organization instructed me to do, and yes Thunderbird was able to retrieve the correct server settings, but somehow the password is still "wrong". I read a post from a Microsoft tech who says, if the email account uses a two-step authentication, then putting in the app-generated password will do. Sadly this doesn't work either. Has anyone else come across with this issue before?