And your question and configuration would be...?
A wild guess; you've marked Outlook to work Offline. File-> Work Offline

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Robert Sparnaaij [MVP-Outlook]
Coauthor, Configuring Microsoft Outlook 2003
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Real World Questions, Real World Answers
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> I have desktop notification set up, but my emails won't show up now,
> unless I
> hit the send/receive button. I was getting the envelope on the toolbar,
> and
> the little box would pop up, but for some reason it has disappeared.