Hi Tonycd,
Exchange Server 2003 Standard Edition is limited to a single storage group with a single private information store database and a single public folder database. Prior to SP2, each database was limited to 16 GB of total physical size. SP2 increases the licensed database size limit for Exchange Server 2003 Standard Edition from 16 GB to 75 GB; the default configured database size limit will be 18 GB. Exchange Server 2003 Enterprise Edition storage group and Exchange store options do not change with the application of SP2. However, a configurable Exchange store size limit is added to the Enterprise Edition.
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Exchange Server 2003 version
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Licensed limit
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Default configuration limit
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Standard Edition before SP2
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16 GB
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Not applicable
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Standard Edition with SP2
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75 GB
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18 GB
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Enterprise Edition before SP2
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8,000 GB (unlimited)
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Not applicable
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Enterprise Edition with SP2
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8,000 GB (unlimited)
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8,000 GB
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So if you add Database Size Limit in Gb registry, the dismount size limit is 75 GB. However, if you don’t add Database Size Limit in Gb registry, the database size limit is 18 GB.
The Database Size Buffering in Percentage setting is a configurable error threshold that will warn you with an event log entry when your database is at or near capacity, and will shut down within 24 hours of the event being logged. By default, Exchange Server 2003 SP2 logs events when the database has grown to within 10 percent of the configured database size limit. This threshold is configurable. The smallest buffer is 1 percent of the configured size limit.
If you database size exceed 75 GB and is dismounted, you can try to upgrade Exchange Server standard edition to Exchange Server enterprise edition.
For more information about Upgrading from Exchange Server Standard Edition to the Enterprise Edition
http://support.microsoft.com/kb/170280
For other methods, please refer to the following articles:
Exchange Server 2003 mailbox store does not mount when the mailbox store database reaches the 16-GB limit
http://support.microsoft.com/kb/828070/
Database Size Limit Configuration and Management
http://technet.microsoft.com/en-us/library/aa998066(EXCHG.65).aspx
Rock Wang
Rock Wang– MSFT
