I have made the appropriate change in the regsistry and restarted the MsExchangeIS service (also restarted the server) but the Store has not increased in size. The Event Viewer ID 1216 does not acknowledge that the store limit has been increased (still says 18gb). Exchange Server SP2 has been applied prior to the change. There is plent of room on the hard disk drive(s) of this server.

Hello MichaelRychter, Please follow this KB article it will help you. How to increase the Exchange Server 2003 Service Pack 2 18-gigabyte database size limit http://support.microsoft.com/kb/912375 Exchange Server 2003 mailbox store does not mount when the mailbox store database reaches the 16-GB limit http://support.microsoft.com/kb/828070/en-us Ramifications of running the eseutil /p or edbutil /d /r command in Exchange http://support.microsoft.com/kb/259851 After follow this your problem will be resolved. MicroSoft Exchange Admin. & Connector EXCHANGE2010, MCSE, MCTS, MCSA MESSAGING, CCNA & GNIIT

Hi Michael, The new database limit increase also applies to SBS 2003 Servers with Exchange 2003 SP2 applied. And PKT provide the right KB to edit the registry. http://support.microsoft.com/kb/912375 Could you please post the value you added here? Though I have test that the value is not case sensitive(Gb same as GB,but someone point it shold be Gb rather than GB). Actually, you just need to remount the database to check the event 1216 because the database size limit registry keys are read when the database mounts . Frank Wang

Hi Michael, How about your question? Any updates?Frank Wang

Hi Michael, Any updates?Frank Wang