Maximum database size
With Exchange 2010, Microsoft has increased its recommended maximum database size to 2 TB instead of the 250 GB that most administrators considered the practical maximum in Exchange 2007. The increase in database page size to 64 KB has moved the maximum theoretical size of a database to the NTFS limit (16 TB–64 KB). To be safe, the absolute limit for an Exchange 2010 database is 16,000 GB, just below the NTFS theoretical limit. Few customers are likely to operate databases that are anywhere near this value in the next decade, especially when they consider just how long it will take to restore such a monster database, should that need arise.
An eight-fold to ten-fold increase in recommended database size in one software version ...
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