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Max FXGetBuffer Users parameter is non-default

[This topic is intended to address a specific issue called out by the Exchange Server Analyzer Tool. You should apply it only to systems that have had the Exchange Server Analyzer Tool run against them and are experiencing that specific issue. The Exchange Server Analyzer Tool, available as a free download, remotely collects configuration data from each server in the topology and automatically analyzes the data. The resulting report details important configuration issues, potential problems, and nondefault product settings. By following these recommendations, you can achieve better performance, scalability, reliability, and uptime. For more information about the tool or to download the latest versions, see "Microsoft Exchange Analyzers" at http://go.microsoft.com/fwlink/?linkid=34707.]  

Topic Last Modified: 2005-11-18

The Microsoft® Exchange Server Analyzer Tool reads the following registry entry to determine whether the Max FXGetBuffer Users registry key has been created:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem

If the Exchange Server Analyzer finds that the Max FXGetBuffer Users registry key has been created under ParametersSystem, the Exchange Server Analyzer displays a non-default configuration message.

You can use the Max FXGetBuffer Users registry key to control the number of Microsoft Office Outlook® 2003 clients that synchronize with an Exchange Server 2003 server at the same time. You set the value for the Max FXGetBuffer Users registry key to override the limit on simultaneous remote procedure call (RPC) connections that are made by Outlook clients. These connections are sometimes referred to as ropFXSrcGetBuffers. You calculate the default value for the Max FXGetBuffer Users registry key by taking the number of processors that are on the server, multiplying that number by 2, and then adding 3. For example, on an Exchange Server 2003 server that has two processors, the default value is 7 ([2*2] + 3=7).

The Exchange Server Analyzer reports this configuration for informational purposes only. No action is required.

importantImportant:
This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore the registry if a problem occurs. For information about how to restore the registry, view the "Restore the Registry" Help topic in Regedit.exe or Regedt32.exe.
To restore the default configuration
  1. Open a registry editor, such as Regedit.exe or Regedt32.exe.

  2. Navigate to: HKLM\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem

  3. Delete the Max FXGetBuffer Users value.

  4. Close the registry editor.

The Microsoft Exchange Information Store service detects the changes in minutes. You do not have to restart the computer.

Before you edit the registry, and for information about how to edit the registry, see the Microsoft Knowledge Base article 256986, "Description of the Microsoft Windows Registry" (http://go.microsoft.com/fwlink/?linkid=3052&kbid=256986).

For more information about setting registry keys to control the number of Outlook clients that can synchronize with Exchange Server 2003, see the Knowledge Base article, 818484, "Registry Values and Counters That You Can Use to Configure and Monitor Outlook Client Synchronization" (http://go.microsoft.com/fwlink/?linkid=3052&kbid=818484).

 
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