As an archiving alternative, keep mailbox sizes down but allow users to keep email for years
Take advantage of the Exchange 2010 Personal Archive while keeping database sizes relatively small
Allow Exchange administrators to keep database sizes manageable by moving attachments to low cost file or web servers
Alleviate time constraint challenges in moving mailboxes from one database or server to another by keeping mailbox sizes smaller
Reduce the storage burden created caused by the loss of the Single Instance Store and the addition of Database Availability Groups
Leverage all the functionality of Exchange 2010 without requiring massive amounts or storage and keep database sizes relatively small
Reduce the burden on your backup and recovery infrastructure