Go to Tools, Accounts, select that mail account, Properties, Servers.
Make sure the box for "Log on using Secure Password Authentication."
is unchecked.

If it was already unchecked, which antivirus are you running?
Some of them are not fully compatible with Windows Mail.

--
Gary VanderMolen, MS-MVP (Mail)


"CoCojax" <CoCojax@discussions.microsoft.com> wrote in message news:0D766ED9-FBAD-46AC-9D24-79FD2F614119@microsoft.com...
>
> I am having the same problem, mine started yesterday evening when I got home
> after a week of vacation...
> Keeps requesting me to sign in and when I do I receive this error message..
>
> Account: 'Windows Mail', Server: 'pop.broadband.rogers.com', Protocol:
> POP3, Server Response: '-ERR popgate argument(s) missing.', Port: 110,
> Secure(SSL): No, Server Error: 0x800CCC90, Error Number: 0x800CCC91
>
> and then a different message...
>
> Account: 'Windows Mail', Server: 'pop.broadband.rogers.com', Protocol:
> POP3, Server Response: '-ERR [AUTH] Error logging in. Please visit
> http://mail.yahoo.com', Port: 110, Secure(SSL): No, Server Error: 0x800CCC90,
> Error Number: 0x800CCC92
>
> Seems like a lot of users are having similar problems so I am confused as to
> why Windows has not come up with an answer...I have just completed my
> updates...