Intermittent problems with messages not showing up in inbox immediatly

We are having intermittent problems with several of our users Microsoft outlook 2000.  The common complaint is that e-mail will not show up immediately and will only show up when they hit the “New” button for creating an e-mail or the “Send and Receive” button.   It’s as if the client temporarily loses connection with exchange and reconnects when the user hit a button on the outlook interface.  Has anyone heard of this bug or knows of any documentation on this.  We are running Microsoft office 2000 sr-1, service pack 1.  The computers are xp pro service pack 1.
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Not sure if the office 2000 you have is the latest or not
go to and check

Also in outlook do this
open Outlook
click on Inbox on the left navigation pane
go to tools > send/receive settings > define send/receive groups
click on all accounts to enable it
in the bottom , check Schedule an automatic send/receive every XX mins
give 1 for XX

check if it would does check for email every min

Also make sure there is no issues in your exchange server

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