Having upgraded two laptops and one desktop to Windows 10 and set up my emails on each I am getting the 

server error code : 0x800CCC90

server response:-ERR(auth)(#MBR1212) incorrect username or password.

server:'mailbtinternet.com'

Windows Live MailError ID:0x800CCC92

Protocol: POP3

Port :110

Secure(SSL): No

I have removed this account three times and set it up again, using the same correct username and password that allows me access to this account on both laptops, but am unable to access this account on my desktop.

Why ???