NOTE: This procedure assumes that you have followed the recommended Ipswitch Analytics Exchange Support setup and configuration, and created a Ipswitch Analytics Exchange Mailbox Database specifically for Ipswitch Analytics Exchange Support. Removing an Exchange Mailbox Database removes all Exchange Mailboxes contained within it.
After removing the Ipswitch Analytics Exchange Mailbox Database Exchange 2013 may instruct you to manually remove the database file if it exists.
from: https://technet.microsoft.com/en-us/library/jj150580(v=exchg.150).aspx
Use the EAC to remove a mailbox database
Open the Exchange Management Shell as Administrator and execute the Remove-MailboxDatabase cmdlet:
Remove-MailboxDatabase "IpswitchAnalyticsDatabase"