Connect to the Server that is running Exchange 2003 SP2
Click Start > Run > type regedit > input Admin credentials > click OK
Click one of the following registry subkeys, as appropriate for the store that you want to increase:
For a mailbox store, edit the following registry subkey: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeIS\Server name\Private-Mailbox Store GUID
For a public folder store, edit this subkey: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeIS\Server name\Public-Public Store GUID
The following sequence would set Exchange database size to its allowable maximum of 75 Gigabytes: Edit > New > DWORD > name the new key as "Database Size Limit in Gb" > set value = 75 > OK
Restart the Microsoft Exchange Information Store service: Start > Run > type "cmd" > press Enter > type in these lines...
net stop msexchangeis
net start msexchangeis
Examine the Application log to verify that the database size has been set successfully. To do this, follow these steps: Start > Run > type "eventvwr.exe" > press Enter > navigate to the Application hive > locate event ID 1216 > verify that the database size has been set as configured within the registry
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