The Microsoft Exchange information store utilizes the Exchange database engine. The maximum allowed size of a single database in Exchange versions 4.0 and 5.0 is 16 GB (Priv.edb can be 16 GB and Pub.edb can be 16 GB). After the limit is reached, the Exchange database engine stops taking transactions and notifies the information store to shut down.
NOTE : Microsoft Exchange Server 5.5 Enterprise Edition information store databases are not limited to 16 GB; they are limited only by available hardware.
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