Exchange 5.5 Directory Object | Equivalent Active Directory Object | Comments |
| Mailbox | Mailbox-enabled user | Mailbox-enabled users are security principles in Active Directory that can send and receive messages. |
| No direct correlation with a 5.5 object | Mail-enabled user | Mail-enabled users are those who can logon to your domain with a user account in your domain, but whose e-mail is sent to an external address. This type of user is best suited for long-term contractors who need access to resources on your network but who need to send and receive e-mail through their employer's e-mail system. |
| Custom recipient | Mail-enabled contact | All mail-enabled contacts have an SMTP address. These are always users outside your Exchange organization. |
| Distribution list | Mail-enabled group | Domain local, global, and universal groups can be mail enabled. |
| Public folder | Public folder | Mail-enabled public folders can be created only in the Exchange System snap-in or the Active Directory Connector. |
