Exchange 2007 Recipient Facts

A recipient is an Active Directory object that has Exchange mail capabilities. The following table explains the Exchange 2007 recipient types:

Recipient type	Description
User mailbox	A user mailbox is associated with an Active Directory user account. All of the messages, calendar items, documents, contacts, tasks, and other data that are associated with a mailbox-enabled user are hosted on one of the mailbox servers within an Exchange organization. A mailbox-enabled user can log on to the domain and access resources on the network according to the permissions and groups to which they are assigned. User mailboxes are the most common type of Exchange recipient. Note: The mailbox data that is stored in the Exchange mailbox database is marked for deletion and the associated user account is also deleted from Active Directory when a mailbox is removed. The user account can be retained by disabling the mailbox.
Mail user	A mail user is a mail-enabled Active Directory user that has an e-mail address associated with an account, but whose mailbox is stored on an external mail system. For example, a contractor who is working for the organization but is using their own e-mail address.
Mail contact	A mail contact is a mail-enabled Active Directory contact that contains information about people or organizations that exist outside an Exchange organization. Mail contacts are used to make it easier for users within an organization to locate the contact details of people outside of the organization. A mail contact is similar to a mail user, but a contact can't be used for logon.
Mail-enabled universal distribution group	A universal distribution group is a mail-enabled Active Directory distribution group object that is used to distribute e-mail messages to a large number of people in an organization, such as entire departments or groups. Note: Unlike previous versions of Exchange, a distribution group in Exchange 2007 must be a universal group.
Mail-enabled universal security group	A universal security group is a mail-enabled Active Directory security group object used to grant access permissions to resources in Active Directory in addition to distributing messages to departments or groups. Use a security group if you need to use the group to control access to resources in addition to using it for mail distribution.
Dynamic distribution group	A dynamic distribution group is a distribution group whose membership is defined by the results of a query (as opposed to a defined set of recipients) which is executed every time a message is sent to the group. This is optimal for environments in which people move groups or buildings often and e-mail groups need to be able to accommodate changes as they occur. Note: Because of the additional load that is placed on global catalog servers when a dynamic distribution group query is run, it is best to limit the amount of dynamic distribution groups that are created.
Mail-enabled non-universal group	A non-universal group is a mail-enabled Active Directory global or local group object which has been brought over from previous versions of Exchange. You can manage these groups with Exchange 2007, but not create them.
Room mailbox	A room mailbox is assigned to a meeting location. Use room mailboxes to schedule meeting rooms. When you create a room mailbox, a disabled user account is created for the room. You then specify a user who manages the room, or you can configure a calendar so schedule requests are handled automatically.
Equipment mailbox	An equipment mailbox is assigned to a resource that does not have a specific location. Examples include a portable projector or a company car. You can use equipment mailboxes for requesting and scheduling equipment use. Like a room mailbox, an equipment mailbox has a disabled user account and a managing user. You can also configure the calendar for automatic scheduling.
Mail-enabled public folder	A mail-enabled public folder is a public folder that can receive messages. Messages that are sent to e-mail addresses are posted in public folders.
Linked mailbox	A linked mailbox is a mailbox that is assigned to an individual user in a separate, trusted forest. Multiple forests usually exist for the following reasons: An organization deploys one forest for user accounts for the staff and deploys a second forest for the resources for the organization such a print services or Exchange. Administration requirements are distinct for different parts of the organization. Different areas of the organization require distinct schemas. Multiple companies have merged together. You should understand the following about linked mailboxes: When a linked mailbox is created, a mailbox and a disabled user account are created in the forest which hosts the Exchange organization. Once the mailbox has been created, it is then linked or associated with a user account that resides in the second forest. To assign an account from the second forest to the mailbox, a trust relationship must exist between the domain that contains the Exchange server and the domain in which the user account resides.
Shared mailbox	A shared mailbox performs the same functions as a user mailbox, but is associated with multiple Active Directory user accounts. Note: Even though Exchange 2007 supports shared mailboxes, it is a de-emphasized feature that can only be managed through the Exchange Management Shell. It is recommended to use resource mailboxes or Microsoft SharePoint Portal Server portals for collaboration instead of shared mailboxes.
Legacy mailbox	A legacy mailbox is a mailbox which resides on an Exchange Server 2003 or Exchange 2000 Server.
Mail forest contact	A mail forest contact is a read-only recipient object from another forest that is created and managed by Microsoft Identity Integration Server (MIIS) synchronization. Mail forest contacts cannot be removed or modified through the Exchange Management Console or the Exchange Management Shell.
Microsoft Exchange recipient	The Microsoft Exchange recipient is a special recipient object that: Differentiates system-generated messages from other messages. Replaces the “System Administrator” sender that was used for system-generated messages in earlier versions of Microsoft Exchange Server.

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