The following command would give you some serious level of statistics that can also be daunting for you 🙂
Get-MailboxDatabase <Database-Name> | FL
The right side of the result is omitted, but focus on the left side of it, what you can achieve by this single command:
Some of the switches you can use to apply policy to the objects:
- ProhibitSendReceiveQuota
- IssueWarningQuota
- ProhibitSendQuota
- DeletedItemRetention
- IsExcludedFromProvisioning
Further Reading: http://msdn.microsoft.com/library/ff326162%28v=exchg.150%29.aspx