Microsoft Exchange Server 2010 Setup creates a Discovery mailbox by default. Discovery mailboxes are available as target mailboxes for discovery searches in the Exchange Control Panel. You can create additional Discovery mailboxes as required. A Discovery mailbox can’t be repurposed or converted to another type of mailbox. You can remove a Discovery mailbox using the same procedure used to remove other types of mailboxes.
After a discovery search is completed, the Discovery mailbox used as a target mailbox for the search can potentially contain sensitive information. You should control access to Discovery mailboxes and ensure only authorized persons have access to them.
Looking for other management tasks related to Multi-Mailbox Search? Check out Managing Discovery.