Most organizations use service accounts with access to specified groups of mailboxes to target searches, however in some conditions or as a backup an option you can use is the LDAP method. For example, you can use LDAP to return mailboxes in chunks (all As or Bs, etc).

Below is an example query - this is placed in the LDAP box for the Exchange server entry.

<LDAP:/server.domain.com/OU=ou,DC=domain,DC=com>;(& (mail=*) (| (&(objectCategory=person)(objectClass=user)(!(homeMDB=*))(!(msExchHomeServerName=*)))(&(objectCategory=person)(objectClass=user)(|(homeMDB=*)(msExchHomeServerName=*))) ));mail;subtree

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