i have the same problems

Unable to send or receive messages for the Birdsathome (vogelopvang) account. Windows Live Mail couldn't log on to the email server using secure password authentication. Contact your email provider and verify that it supports secure password authentication. To change this logon setting, in the folder list, right-click on the account name, and then click Properties on the shortcut menu. In the Properties dialog, click the Servers tab, and then under Incoming Mail Server, select a logon option.

Server Error: 0x800CCC90
Server Response: -ERR Invalid command.
Server: 'mail.birdsathome.nl'
Windows Live Mail Error ID: 0x800CCC18
Protocol: POP3
Port: 110
Secure(SSL): No

i have contact with my provider and we can't fix the problem

greetings donny

Split from an unrelated thread 

My 3 e.mail address' no longer accept the passwords I have had for a long time. When I go to the reset password the letters to reset the password's the programme will not accept the letters I enter, which I have done many times.

Below are the error message for one of my address'. I can send an e-mail but not receive them.                                                                                                                                                                     Unable to send or receive messages for the Ntlworld account. An incorrect password was entered. The next time you send or receive messages, you'll be asked to enter your user name and password for this account.

Server Error: 0x800CCC90
Server Response: -ERR [AUTH] Username and password not accepted.
Server: 'pop.ntlworld.com'
Windows Live Mail Error ID: 0x800CCC92
Protocol: POP3
Port: 110
Secure(SSL): Nocept what I type in

Unable to send or receive messages for the Ntlworld (colin.lloyd7) account. Windows Live Mail couldn't log on to the email server using secure password authentication. Contact your email provider and verify that it supports secure password authentication. To change this logon setting, in the folder list, right-click on the account name, and then click Properties on the shortcut menu. In the Properties dialog, click the Servers tab, and then under Incoming Mail Server, select a logon option.

Server Error: 0x800CCC90
Server Response: -ERR Protocol error.
Server: 'pop.ntlworld.com'
Windows Live Mail Error ID: 0x800CCC18
Protocol: POP3
Port: 110
Secure(SSL): No
My 3 e.mail address' no longer accept the passwords I have had for a long time. When I go to the reset password the letters to reset the password's the programme will not accept the letters I enter, which I have done many times.

Below are the error message for one of my address'. I can send an e-mail but not receive them.                                                                                                                                                                     Unable to send or receive messages for the Ntlworld account. An incorrect password was entered. The next time you send or receive messages, you'll be asked to enter your user name and password for this account.

Server Error: 0x800CCC90
Server Response: -ERR [AUTH] Username and password not accepted.
Server: 'pop.ntlworld.com'
Windows Live Mail Error ID: 0x800CCC92
Protocol: POP3
Port: 110
Secure(SSL): Nocept what I type in

Unable to send or receive messages for the Ntlworld (colin.lloyd7) account. Windows Live Mail couldn't log on to the email server using secure password authentication. Contact your email provider and verify that it supports secure password authentication. To change this logon setting, in the folder list, right-click on the account name, and then click Properties on the shortcut menu. In the Properties dialog, click the Servers tab, and then under Incoming Mail Server, select a logon option.

Server Error: 0x800CCC90
Server Response: -ERR Protocol error.
Server: 'pop.ntlworld.com'
Windows Live Mail Error ID: 0x800CCC18
Protocol: POP3
Port: 110
Secure(SSL): No

Original title: Password not accepted
I use Windows Live Mail for e mail with an address btinternet.com through BT Yahoo. I am now unable to send or receive e mails and get the following error message when opening Windows Live Mail: - "Unable to send or receive messages for the Peter & Margaret Bennie account. Windows Live Mail couldn't log on to the e-mail server using secure password authentication. Contact your e-mail provider and verify that it supports secure password authentication. To change this logon setting, in the folder list, right-click on the account name, and then click Properties on the shortcut menu. In the Properties dialog, click the Servers tab, and then under Incoming Mail Server, select a logon option.  Server Response: . Server: 'mail.btinternet.com' Windows Live Mail Error ID: 0x800CCC18 Protocol: POP3 Port: 110 Secure(SSL): No"
I have checked as instructed but despite switching off and the non the Secure Password Authentication button nothing improves the situation.
When connecting to my email address via outlook I get "The server you are connected to is using a security certificate that does not match its Internet Address. Do you want to continue using this server?". I understand this can be caused by man-in-the-middle attacks. I have been checking my email comfortably for years before this problem occurred. I am using:

pop3.live.com
port: 995
This server requires a secure &connection (SSL)
No Secure Password Authentication

smtp.live.com
Port: 25
This server requires a secure &connection (SSL)
Outgoing server requires authentication -> Use same settings as my incoming mail server

Have you changed certificates within the last month? Could you provide new details?