Previously posted in XP forumbut somehow the message was picked up and posted in Windows 7 forum?? After installing a new Norton security system - from my mail server, I also atttempted to update Outlook Express 6 to OE 8. I now get the following error message:Unable to logon to the server using Secure Password Authentication. Account: 'Bills Mail', Server: 'Mail.comcast.net', Protocol: POP3, Server Response: '-ERR invalid command', Port: 110, Secure(SSL): No, Server Error: 0x800CCC90, Error Number: 0x800CCC18 I can't receive or send mail. I still have my existing addresses but nothing else opens. I have checked my ISP account info. along with security I.D. and all is OK. I have tried to re-enter all accout data several times without any effect. I have closed the Norton security for both incoming and outgoing mail and this didn't have any effect either. I have cleaned up all data in my file, still no help. When I tried to update to OE 8, only OE 6 appeared! Tried several times to re-install OE 8 only to repeatedly be sent back to OE6. Have been trying to correct problem for 4 days without any solutions1 person got this answerI do too