See if any of the troubleshooting here helps:
http://support.microsoft.com/kb/154578/en-us

wrote in message ...
I have setup 5 different E-mail account in 5 outlook Profile. The error is
when sending mail in anyone mail profile, The sending mail holding in the
outbox 5 min, after show the tim-out message,the error message as below -
I
have using outlook xp sp3 with Internet services account. When I
sendmessage
click send/received buttom, the details show completed first, after
decrease
to 50%, 30% .25%, after show 0x800CCC0B error message. I have try increase
the server time-out to max, but not change, is any possible
solution solve out this error. Also I have try remove norton antivirus and
no windows firewall install on this PC.
Please advice how to fix this problems ASAP.