Troubleshooting Outlook Express Error 0x800CCC90/91
  • There was a problem logging onto your mail server.
  • Your UserName was rejected. Account: 'pop.yourname', Server: 'pop3.'.norton.antivirus', Protocol: POP3, Server Response: '-ERR', Port: 110, Secure(SSL): No, Server Error: 0x800CCC90
  • Error Number: 0x800CCC91
This error message is caused by the fact that you have set an anti virus program, in this case Norton AntiVirus, to scan all emails automatically.

Changing the settings within Outlook Express will not solve the issue. You need to go to Norton and change the settings there. To do this in Norton 2000 click here and for Norton 2001 click here.