Take a look here, it may help:
http://www.howto-outlook.com/Faq/mes...ckinoutbox.htm

"js" wrote in message
...
hi, I sent a 500 mb mail, but failed to send it out,
it stays in my outbox now. and will popup an error:
"Task "xx" - Sending' reported error(ox80042108): 'The operation timed out
waiting for a response from the sending (SMTP) server. If you continue to
erveive this message, contact your server administrator or Internet
service provider(ISP).'
I don't want to send it now, hwo to remvoe it from the outbox? I can't for
now. Thansk.