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Exchange 2010 mailbox database size limits

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linux-howto

http://serverfault.com – I am going to start a migration from and Exchange 2003 cluster to a new Exchange 2010 SP2 with 14 mailbox databases of a supposed maximum size of about 400 GB each. Each database will be divided into 2 LUNS, data and transaction logs. LUN size takes into account to leave about 20% of free space to avoid monitoring alerts. As mailboxes will be distributed randomly during migration, how can I be sure that 400 GB database size limit will not be exceeded? And after migration, as mailboxes will grow time by time, how to make Exchange respect database size limits? (HowTos)