Topic Last Modified: 2007-01-08

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 mailbox store databases:


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.

The Exchange Server 2007 Standard Edition hard coded licensing database size limit of 50 GB can also be increased 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>\Private-<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 (