DB2DIR allows mailboxes to be generated on directory and messenging services. It can also generate distribution lists.

The current implementation handles Exchange 5.5., Exchange 2000 or Lotus Domino, for lack of a standard mailbox generation procedure. In Exchange the generated mailboxes are linked to the NT user accounts (not only are the login name and mailbox name, the passwords identical but also management of both is completely integrated.

However the protocol used (LDAP) leaves room for extension to other messenging services.