Outlook 2007 will not send mail

I recently upgraded to Office 2007 and now Outlook will no longer authenticate with my email server. I'm receivng this error: None of the authentication methods supported by this client are supported by your server.

This worked perfectly with Outlook 2003. I have not been able to find a solution to this anywhere. Any ideas?

What type of email do you have (I'm not asking for your address) if you have yahoo pr gmail type web mail, chances are, you just have to go through your port settings in the account setup. Did yoou do an upgrade or did you uninstall 2003 first? If it was an upgrade, the settings should have carried over...

I did full uninstall with REVO and fresh install office 2007. I have POP email acct from Charter Comm.

I think I fixed it. Did not know that 07 outlook had repair option, tried it and seems like email is working correctly with test emails and a personal test to a friends acct. Thanks for the help and quick responses.