If you are sure about the username and password, disable you anti virus mail scanner and see if that is the issue.

I had to disable something called sonar in Nortons to add a new outlook mail account.

Matt said

If you are sure about the username and password, disable you anti virus mail scanner and see if that is the issue. I had to disable something called sonar in Nortons to add a new outlook mail account.

Thanks for you helps, however I'm on linux ubuntu, and I had it working until 5-6 days ago, I even tried with other mail clients, same problems. I'm starting thinking microsoft guys have changed something ... Don't know what to do :(

Try using the settings here https://thunderbirdtweaks.blogspot.com/2016/06/hotmail-proxy-errors.html

Is pop turned on?

Thanks for you help... I've already tried both imap and pop with no luck :(

Same username / password incorrect

Do you have 2-step verification set up on the account?

sfhowes said

Do you have 2-step verification set up on the account?

No, I don't!

It seems to be so strange, because I'm already trying other mail clients and they all have the same problem.

Is it maybe a linux thing? (I have ubuntu)

I would suggest you try an app password. https://support.microsoft.com/en-au/help/12409/microsoft-account-app-passwords-and-two-step-verification

Matt said

I would suggest you try an app password. https://support.microsoft.com/en-au/help/12409/microsoft-account-app-passwords-and-two-step-verification

Sorry I'm not following... that should help?

well it might. it is clearly not working as it is.

Matt said

well it might. it is clearly not working as it is.

I've done it... still doesn't work