In order to configure your Mailbox store size you will need to edit the registry. As always, when working in the registry, please make a backup to ensure a quick recovery.

On the server running Microsoft Exchange 2003 SP2, click start -> run.

Type regedit.

Navigate to HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeIS\SERVERNAME\

You can modify the size of both the private and public mail stores. In this example we will modify the private store size.

Select the folder "Private-MailboxStoreGUID.

Right click on Private-MailboxStoreGUID and select New -> DWord Value.

Name the DWord Value "Database Size Limit in Gb" (without quotes).

Right click on  Database Size Limit in Gb and click edit.

Choose decimal and change the value to the size you want to configure in GB.
EXAMPLE: If you have a 60gig system partition, you might want to configure you maximum size somewhere around the 40 to 45 gb so you don't run into diskspace problems.

Select ok to save your settings. 

Restart the information store service.

Upon restart, you should see Event ID 1216 under Application Logs which should reflect the changes you just made. 

This information is provided "AS IS" with no warranties expressed or implied.

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