how to reduce size of exchange 2013 database

i have an exchange 2013 server. I have 2 databases. i have already move all my mailboxes to another database except one mailbox. The size of the remaining mailbox probably only 3GB. But the database size is like 49GB.

I have also set the "*Keep deleted items for (days):" and "*Keep deleted mailboxes for (days):" to zero .

I have performed a eseutil /d on the database. It only shrink to 2GB to 37GB.

i was thinking of moving the remaining mailbox and delete the database and recreate a new database. but I read about this and learned that there will be some error because if some built in mailbox created within automatically.

Pls advise
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Mahesh SharmaCommented:
1. Find the Arbitration Mailbox using the Exchange Management Shell (EMS):

Get-Mailbox -Arbitration | Where {$_.Name -like "SystemMailbox*" } | ft –wrap

2. Now create a new move request in order to move the system mailboxes to another mailbox database:

New-MoveRequest -Identity "SystemMailbox{1f05a927-32d1-4e19-8ea5-67eba859f541-yourGUID}" -TargetDatabase "dbxxxx"
Mahesh SharmaCommented:
Move the system mailbox to other DB & then delete the first DB
dnackAuthor Commented:
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