Expanding the size limit in Exchange 2003 SP2 edition

A client requested an expansion of their size limit on the container that houses the public folders for their Exchange environment. The expansion of the database involves a simple registry entry and restarting the Information Store. Please note that while the change is simple, Microsoft set the default limits with a plan in mind. Make sure the size change works with the plan for your Exchange environment.

Step 1:

Open regedit, navigate to the HKLM, system, CurrentControlSet, Services, MSExchangeIS, “server name”, “public GUID” (replacing the server name and public GUID with the one for your server).

Step 2:

Add a DWORD value “Database Size Limit in Gb,” with the size in GB, decimal value.

Step 3:

Restart the information store or restart the server. If the change was applied correctly you will see event 1216 appear in the application log with the changed size noted.

Adapted from http://www.msexchange.org/tutorials/Explaining-Database-size-limit-changes-Exchange-2003-Service-Pack-2.html