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Well the Exchange 5.5 Enterprise had no limits.
Exchange 2003 Standard had an 16GB per database limit which was increased to 75GB with Service Pack 2 but defaults to 18GB and must be modified in the Registry to actually support a larger database.
The Exchange 2003 Enterprise version does not have this limit and can support a theoretical 8000GB database.
The Exmerge utility allows you to manually export out mailboxes and contacts but does not fully support all the folders of the inbox.
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