Only receive emails when user clicks button in Outlook

We currently use Outlook for our email with Exchange Server 2003.  We have it set up that users automatically receive emails throughtout the day when they have Outlook open.  Three of our users only receive emails when they physically click on a button within Outlook.  When they hit a button, the emails will then appear.  They are not automatically coming into their mailbox.  As soon as they hit a button (any button not just Send/Receive) new messages will poor in.  Is anyone else experiencing this?  Thanks!!  
wpbdomainAsked:
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sirbountyCommented:
See this: http://www.experts-exchange.com/Q_21221854.html

You might also try grabbing the latest updates from http://officeupdates.microsoft.com - this was supposedly fixed in a patch.
Additionally, you might try
Start->Run->Outlook /Cleanprofile <Enter>

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