If you use Network Address Translation (NAT), you may not see new e-mail or receive notifications for new e-mail in Outlook 2000.

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This problem can occur in a NAT environment because Outlook 2000 never receives the UDP (Universal Datagram Packets) that the Microsoft Exchange Server sends, and you cannot route the UDP packets to a computer that is running Outlook 2000.

The computer that is running Outlook 2000 returns to polling the Exchange Server for new e-mail messages by using the Remote Procedure Call (RPC) to work around this problem. However, a logic error exists with the Exchange Server and it does not reply to the polling request.

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To resolve this problem, use the following two methods to configure Outlook 2000 to use polling instead of UDP to receive new e-mail notifications:

1.	Apply the associated hotfix to the computer that is running Outlook 2000.
2.	Manually add registry entries.

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How to Use the Hotfix

To resolve this problem, obtain the latest service pack for Microsoft Office 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base: IMPORTANT: Before you install Microsoft Office 2000 Service Pack 3 (SP-3), you must have Microsoft Office 2000 Service Release 1/1a (SR-1/SR-1a) installed first. To obtain SR-1/SR-1a, click the article number below to view the article in the Microsoft Knowledge Base:

The English-language version of this fix should have the following file attributes or later:

    Date        Time        Version     Size       File name
    ------------------------------------------------------
    07/06/2001  10:48:50pm  5.5.3160.0  594,192    Emsmdb32.dll
    07/06/2001  10:32:36pm  9.0.0.5505  5,328,946  Outllib.dll
				

The fix is also available for the following language(s): German, Italian

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How to Manually Add Registry Entries

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:

NOTE: If Office 2000 (SP-3) has already been installed, you do not have to install the fix. If Office 2000 (SP-3) has already been installed, follow these steps to add the registry values to apply the settings.

To add the registry values to the computer that is running Outlook 2000, follow these steps:

1.	Click Start, and then click Run.
2.	In the Open box, type Regedt32.exe, and then click OK.
3.	Locate the following key in the registry: HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Outlook\
4.	On the Edit menu, click Add Key, and then add the following registry key: Key Name: RPC Class: None
5.	Click OK.
6.	Locate the following key in the registry: HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Outlook\RPC\
7.	On the Edit menu, click Add Value, and then add the following registry value: Value Name: ForcePolling Data Type: REG_DWORD Value: 1
8.	Locate the following key in the registry: HKEY_CURRENT_USER\Software\Policies\Microsoft\
9.	On the Edit menu, click Add Key, and then add the following registry key: Key Name: Office Class: None
10.	Locate the following key in the registry: HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\
11.	On the Edit menu, click Add Key, and then add the following registry key: Key Name: 9.0 Class: None
12.	Locate the following key in the registry: HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\9.0\
13.	On the Edit menu, click Add Key, and then add the following registry key: Key Name: Outlook Class: None
14.	Locate the following key in the registry: HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\9.0\Outlook\
15.	On the Edit menu, click Add Key, and then add the following registry key: Key Name: RPC Class: None
16.	Locate the following key in the registry: HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\9.0\Outlook\RPC\
17.	On the Edit menu, click Add Value, and then add the following registry value: Value Name: ForcePolling Data Type: REG_DWORD Value: 1
18.	Quit Registry Editor
19.	Restart the computer.

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Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.
This problem was first corrected in Microsoft Office 2000 Service Pack 3 (SP-3).

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Outlook 2000 uses both UDP and polling to notify you of new e-mail messages.

With UDP, Outlook 2000 sends the server the client's Internet Protocol (IP) address and notifies the server to send the UDP when there are e-mail messages waiting on the server.

The polling mechanism occurs when Outlook 2000 starts a thread that requests information from the server every 60 seconds with the RPC, by default, for any outstanding e-mail messages.

The default preference for e-mail notification in Outlook 2000 is UDP, and if that fails, then it uses polling. The previously mentioned registry value defines whether or not to use polling as the default for new e-mail notification. The value of 1 indicates that polling is used as the default by Outlook 2000 and that UDP will not be used. The default polling time is 60 seconds and is set at the Exchange Server.

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