Exchange store ‘%1’: The logical size of this database (the logical size equals the physical size of the .edb file minus the logical free space) is %2 GB. This database size is approaching the size limit of %3 GB. If the logical database size exceeds the maximum size limit, it will be dismounted on a regular basis.

This Error event indicates that the Microsoft Exchange Information Store database is approaching the maximum size limit. This error may be logged in either of the following scenarios:

• On a computer that is running Microsoft Exchange Server 2007 Standard Edition whose Information Store database size is approaching the hard-coded limit of 50 gigabytes and has not had the maximum database size increased by using the registry.

• On an Exchange Enterprise Edition server that has had the maximum database size restricted to the value specified in the error by using the same registry setting.

To resolve this error, locate the key for the Information store in the registry. A sample registry key is: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\<SERVER NAME>\Private-013e2e46-2cd7-4a8e-bfec-0e4652b94b00

Note   The GUID in this key (Private-013e2e46-2cd7-4a8e-bfec-0e4652b94b00) is an example and should match the value of the objectGUID attribute on the database’s Active Directory directory service object.

Caution   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.

• If the value exists, change the value Database Size Limit in GB to the desired size in gigabytes.

• If the value does not exist, add the DWORD value Database Size Limit in GB and set the value to the desired size expressed in gigabytes.

  Note   The code for Exchange 2007 sets a hard-coded database size limit of 50 gigabytes for the Standard Edition. This can be changed by using the process described here. The Information Store database size for both the Standard and the Enterprise Edition is limited only by disk space.

If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.