Perform an Exchange Discovery Seach

1. Use an account that has been assigned the Discover Management role and has its own mailbox.
   
   
2. Create a new Discovery mailbox which will hold the results of the search (in a subfolder):
   
   New-Mailbox -Name MyDiscoverSearchResultsMailbox -Discovery
   
   
3. EAC > Compliance Management > in-please eDiscovery & hold > + new search
   
   
4. Grant access permission for the user who'll access the search results mailbox:
   
   Add-MailboxPermission "MyDiscoverSearchResultsMailbox" -User "Joe Bloggs" -AccessRights FullAccess -InheritanceType all
   
   

Ta, Microsoft.