What does Alert: "sending of password did not succeed" means?
Opening Thunderbird (I've been using it for years) I get "Alert: Sending of password did not succeed. Mail server pop.windstream.net responded: [IN-USE] account is locked by another session or for maintenance, try again. After clicking OK: "Login to to server pop.windstream.net failed live.mozillamessaging.com uses an invalid security certificate. The certificate is not trusted because no issuer chain was provided.(Error code: sec_error_unknown_issuer)
ყველა პასუხი (1)
For the [IN-USE] error, do you have another device, such as a phone or tablet accessing the account?
https://groups.google.com/forum/#!topic/opera.mail+news/Eghs5f001Hw
As for the login error, see if these discussions offer any help:
http://computers-linux-other-nonsense.blogspot.ca/2013/08/thunderbird-livemozillamessagingcom.html