Unable to send or receive messages for the Btinternet (janeyale234) account. The email server returned an error.

Server Error: 0x800CCC90
Server Response: -ERR [SYS/TEMP] problem retrieving message.
Server: 'mail.btinternet.com'
Windows Live Mail Error ID: 0x800CCC90
Protocol: POP3
Port: 110
Secure(SSL): No

I have tried the 'repair' option.  I says there is an issue but gives no clues as to how it might be fixed.