How to Modify the Size of Databases(Larger than 1 TB ) in Exchange 2010 Standard Edition

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If you want to use databases larger than 1TB on Exchange Server 2010 Standard
Edition, you have to enable it in the registry. To learn how to modify the registry for this
purpose, go to http://go.microsoft.com/fwlink/?LinkId=248378 .

Use Registry Editor to Modify a Database Size Limit

If you change the size limit of your Exchange databases, you may want to evaluate your Exchange database backup and restore plan. Specifically, if you increase the size limit of the Exchange databases, 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).

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.

1. Start Registry Editor (regedit).
2. Locate the following registry subkey:
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\<Server Name>\Private-<database GUID>

   Note:
   You can get the GUID of a database by running the following command in the Exchange Management Shell: Get-MailboxDatabase -Identity "<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 doesn't exist for the subkey, create a new DWORD with that name, and then set its value to the desired size in gigabytes.