Microsoft KB Archive/891536

= How to increase the number of Outlook 2003 clients that your Windows Server 2003 x64-based terminal server can support =

Article ID: 891536

Article Last Modified on 10/11/2007

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APPLIES TO


 * Microsoft Windows Server 2003, Enterprise x64 Edition
 * Microsoft Windows Server 2003, Standard x64 Edition

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Important This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry



INTRODUCTION
This article discusses a registry entry that you can add to a Microsoft Windows Server 2003 x64-based terminal server to configure how frequently Microsoft Office Outlook 2003 checks for network connectivity. You can use the registry entry to increase the number of Outlook 2003 clients that a single terminal server can support.



MORE INFORMATION
Outlook 2003 includes a feature that automatically detects and corrects the loss of network connections to Microsoft Exchange Server computers and to global catalog servers. This feature dramatically improves the user experience in unreliable network environments or when maintenance is performed on servers. Instead of displaying an error message when a user opens an e-mail message after a connection is lost, Outlook tries to reestablish the network connection in the background. If the connection is successful, the e-mail message opens.

By default, Outlook 2003 polls the network connection every 15 seconds. Because this network connectivity detection method is processor intensive, it reduces the number of Outlook clients that a single terminal server can support. To increase the number of Outlook 2003 clients that can be supported, you can configure the ConnManagerPoll registry entry so that Outlook polls the network connection less frequently. However, consider that if you configure the polling interval so that Outlook polls the network connection less frequently, Outlook users may potentially receive more error messages if there are network connectivity issues.

How to add and configure the ConnManagerPoll registry entry
Warning If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

To add and configure the ConnManagerPoll registry entry, follow these steps:  Click Start, click Run, type regedit, and then click OK. Locate and then click the following registry subkey:

HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\RPC

 On the Edit menu, point to New, and then click DWORD Value. Type ConnManagerPoll as the entry name, and then press ENTER. Right-click ConnManagerPoll, and then click Modify. Under Base, make sure that Hexadecimal is selected. Type a value of 600 in the Value data box, and then click OK.

Note This value is the only value that we recommend.</li> Quit Registry Editor.</li></ol>

This registry setting is a per user setting that is stored in each user's profile. To propagate this setting to all users' profiles, you must use a logon script, a Group Policy object, or similar technology.

We currently recommend this registry setting for both AMD64 and Intel Extended Memory 64 Technology (EM64T) servers that are running Microsoft Windows Server 2003, Standard x64 Edition or Microsoft Windows Server 2003, Enterprise x64 Edition. Scalability on a 32-bit operating system is typically limited by other factors. Therefore, this registry setting does not significantly increase the number of Outlook 2003 clients that can be supported on a 32-bit Windows operating system.

Technical support for Windows x64 editions
Your hardware manufacturer provides technical support and assistance for Microsoft Windows x64 editions. Your hardware manufacturer provides support because a Windows x64 edition was included with your hardware. Your hardware manufacturer might have customized the Windows x64 edition installation with unique components. Unique components might include specific device drivers or might include optional settings to maximize the performance of the hardware. Microsoft will provide reasonable-effort assistance if you need technical help with your Windows x64 edition. However, you might have to contact your manufacturer directly. Your manufacturer is best qualified to support the software that your manufacturer installed on the hardware.

For product information about Microsoft Windows XP Professional x64 Edition, visit the following Microsoft Web site:

http://www.microsoft.com/windowsxp/64bit/default.mspx

For product information about Microsoft Windows Server 2003 x64 editions, visit the following Microsoft Web site:

http://www.microsoft.com/windowsserver2003/64bit/x64/default.mspx

Additional query words: ol2003 scalability x64 Winx64 Windowsx64 64bit 64-bit

Keywords: kbhowto kbinfo kbtermserv kbwinservperf KB891536

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