Public Folder Store Database size limit has been set

[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]  

Topic Last Modified: 2005-11-18

The Microsoft® Exchange Server Analyzer Tool reads the following registry entry to determine whether the Database Size Limit in Gb registry value is present and configured for the public folder store:


If the Exchange Server Analyzer finds that the Database Size Limit in Gb value is present and configured, the Exchange Server Analyzer displays a non-default configuration message.

When Exchange Server 2003 Service Pack 2 (SP2) is applied to Exchange Server 2003 Standard Edition, the hard-coded licensing database size limit is increased from 16 gigabytes (GB) to 75 GB. You can set a protective database size limit to prevent unintentional database size growth. The default size limit value in SP2 is 18 GB, and this default value can be overwritten by creating the Database Size Limit in Gb registry value.


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 revert to the default configuration

  1. Open a registry editor, such as Regedit.exe or Regedt32.exe.

  2. Navigate to: HKLM\System\CurrentControlSet\Services\MSExchangeIS\<ServerName>\Public-<MailboxStoreGUID>

  3. Delete the Database Size Limit in Gb value.

  4. Close the registry editor.

Before you edit the registry, and for information about how to edit the registry, see Microsoft Knowledge Base article 256986, "Description of the Microsoft Windows registry" (

For more information about SP2 for Exchange Server 2003, see the Exchange Server 2003 Service Pack 2 Web site (