Optional. Identifies a mailbox.

To apply attributes to all non-system mailboxes on the Exchange server, create a [Mailbox] section and set DistinguishedName to All.

A single [Mailbox] section can contain multiple DistinguishedName keywords, LDAPQuery keywords, or a mixture of the two.

You can run Exchange Mailbox Tasks in report mode to obtain a list of all the mailboxes. You can then copy distinguished names from the report to the initialization file.