Applies to: Exchange Server 2007 SP3, Exchange Server 2007 SP2, Exchange Server 2007 SP1, Exchange Server 2007
Topic Last Modified: 2007-04-06

This topic explains how to use Registry Editor to modify a database size limit in Microsoft Exchange Server 2007. The default database size limit for Exchange 2007 Standard Edition is 50 gigabytes (GB). There is no default database size limit for the Exchange 2007 Enterprise Edition. The Exchange store process checks any database size limits periodically and dismounts a database when the size limit is reached. You can modify the database size limit by adding or changing a value in the registry.

Before You Begin

If you change the size limit of your Exchange databases, you may want to re-evaluate your Exchange database backup and restore plan. Specifically, if you increase the size limit of the Exchange databases, be sure to test your backup and recovery operations using the new database size limits to make sure that you can still meet your service level agreements (SLAs).

Incorrectly editing the registry can cause serious problems that may require you to reinstall your operating system. Problems resulting from editing the registry incorrectly may not be able to be resolved. Before editing the registry, back up any valuable data.


To use the Registry Editor to modify a database size limit

  1. Start Registry Editor (regedit).

  2. Locate the following registry subkey:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\<SERVER NAME>\Private-<database GUID>

    You can get the GUID of a database by running the following command in the Exchange Management Shell: Get-MailboxDatabase -Identity "<server name>\<storage group name>\<database name>" | Format-Table Name, GUID
  3. If the Database Size Limit in GB DWORD exists for the subkey, change its value to the desired size in gigabytes.

  4. If the Database Size Limit in GB DWORD does not exist for the subkey, create a new DWORD with that name, and then set its value to the desired size in gigabytes.

For More Information

For more information about managing storage groups and databases, see Managing Storage Groups and Databases.

To learn more about Registry Editor, see Registry Editor overview.