Symptoms
When you access a Microsoft Exchange Server 2010 mailbox by using Microsoft Office Outlook 2003 in online mode, you may encounter the following issues:
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Outgoing email messages stay in the Outbox folder for up to 1 minute.
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New email messages do not arrive in the Inbox folder immediately and are delayed for up to 1 minute.
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Items that are deleted from folders still appear in the folder for up to 1 minute.
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Items that are moved from one folder to another folder still appear in the original folder for up to 1 minute.
The folder updates do not occur in a timely manner.
Cause
These issues occur because Exchange Server 2010 does not send User Datagram Protocol (UDP) notifications to Outlook.Outlook 2003 uses UDP notifications as the primary method for receiving notifications from an Exchange server. However, Outlook 2003 has to polls the Exchange Server 2010 server for changes, and the default polling interval for Outlook is about 60 seconds. Therefore, a folder update may be delayed up to 1 minute.
Resolution
To resolve this issue, install Update Rollup 3 for Exchange Server 2010 Service Pack 1.
For more information about Update Rollup 3 for Exchange Server 2010 Service Pack 1, click the following article number to view the article in the Microsoft Knowledge Base:
2529939 Description of Update Rollup 3 for Exchange Server 2010 Service Pack 1
After you install this update, you have to create a registry subkey to enable the UDP notifications support feature.
To have us enable the UDP notifications support feature for you, go to the "Fix it for me" section. If you prefer to enable the UDP notifications support feature yourself, go to the "Let me fix it myself" section.
Fix it for me
To fix this problem automatically, click the Fix this problem link. Then click Run in the File Download dialog box, and follow the steps in this wizard.
Fix this problem Microsoft Fix it 50752
Note This wizard may be in English only. However, the automatic fix also works for other language versions of Windows.Note If you are not on the computer that has the problem, you can save the automatic fix to a flash drive or to a CD so that you can run it on the computer that has the problem.
Let me fix it myself
Create the following registry subkey to enable the UDP notifications support feature:
Subkey location: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeRPC\ParametersSystem
Subkey name: EnablePushNotifications
Type: REG_DWORD
Value: 1
Note If this registry key does not exist, or if its value is set to 0, the UDP notification support feature is not enabled.
Workaround
To work around this issue, use the cached exchange mode in Outlook 2003. To do this, follow these steps:
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Exit Outlook 2003 if it is running.
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In Control Panel, click Mail.
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Click E-mail Accounts.
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Select View or change existing e-mail accounts, and then click Next.
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Type a Microsoft Exchange Server account, and then click Change.
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Select the Use Cached Exchange Mode check box.
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Click Next, and then click Finish.
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Start Outlook 2003.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
More Information
To identify if push notifications work, follow these steps:
1. Create the following registry subkey on the CAS server to enable push notifications:
Subkey location: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeRPC\ParametersSystem
Subkey name: EnablePushNotifications
Type: DWORD
Value: 1
Note If theParametersSystem subkey does not exist, create it.
2. Create the following registry subkey on the client computer to configure Outlook 2003 to use a fixed UDP port:
Subkey location: HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\RPC
Subkey name: FixedUDPPort
Type: DWORD
Value: between 1024 and 65535 (decimal)
3. Configure Windows Firewall to allow UDP traffic through this port on the client computer.
4. Open Outlook 2003, and then set up an Exchange profile in a manual operation.
Note Push notifications are supported in only Outlook 2003. Outlook 2007 or a later version will fail to registry push notifications.
5. Send a new email message to the Exchange user.
6. Outlook 2003 displays the new email message within 1 minute.
Note If Outlook 2003 does not register push notifications, it uses polling that occurs every 1 minute. With push notifications, Outlook 2003 receives notifications quicker.
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