Outlook 2000/2002 - No "New Mail" envelope in system tray, New emails not displayed untill you click in the inbox.

I am having difficulty with an Outlook client, it will not display new email untill you click on a mail item within your inbox.

**Sequence of events.**
New mail sent through internal exchange.
No notification in receipients Outlook.
Need to click on a previous email within the inbox for new mail to arrive.
Envelope then appears in system tray and new mail is available in inbox.
...........

It was originally in outlook 2000, and this problem was present.
Tried upgrading to 2002, problem still present.
Uninstalled outlook 2002 - Reinstalled outlook 2002, problem still present.
I have uninstalled AV software, and the problem is still present.

The 'show an envelope in system tray' is turned on.
The problem seems to be with Outlook stalling in its communication with the exchange server.

Windows XP p42.4 512 / Dual Xeon win2k server with exchange.

Any assistance would be greatly appreciated.
zincauAsked:
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Exchange_AdminCommented:
What is probably happening is that the UDP packets (new mail notification) sent from the Exchange server are being blocked. This could be by a router or firewall.

If you have installed XP SP2 on your workstation, then there is a personal firewall that is enabled by default. See if turning this off will resolve the problem.
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zincauAuthor Commented:
Thankyou for the prompt response
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