Outlook 2002: Emails not automatically sending/receiving

Several of our users are having the following problem with Outlook 2002: emails are not sent or received until a user clicks on another item in Outlook such as another email or a folder.  Pressing the send receive button does not do anything (although it does show the send/receive dialog box and indicate that all folders are up to date).  So for example, if I create a new email and press "Send", the email remains in the outbox.  The email does not send, and no new emails are recieved until I click on another email or folder.  The result is that emails are received in clumps (i.e. several emials are delivered at the same time once the user clicks on another email or folder).
The users who are having this problem are using Outlook 2002.  One user has no office service packs applied and the other user has all office service packs and updates applied (up to office 2002 SP3).
If anyone has any thoughts, I would definitely appreciate the help!  Thanks!
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kaedoAuthor Commented:
Thanks for the articles.  Another thing that I found in common with both of the users who were having this problem is that they recently installed XP SP2.  Both of them had the firewall turned on.  When I turned off the firewall, neither one of them had the problem anymore.  I am not 100% positive that this is the solution (it seems odd that the firewall would have anything to do with it) but from the tests I did, the problem presisted when the firewall was on, and stopped once the firewall was turned off.
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