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Answer Posted / rajesh
http://www.computerperformance.co.uk/exchange2007/exchange20
07_recipients.htm
Mailbox User
A mailbox user describes the classic Microsoft Exchange
recipient. They have an Active Directory account, and a
mailbox which connects to a database in your Exchange
organization. 85% of all Exchange 2007 email accounts are
of this MAPI type. As you may anticipate, a user's mailbox
typically contains email messages, calendar items, contacts
and maybe even voicemail. In Exchange Server 2003 this
recipient was called a Mailbox-enabled User, it is also
referred to as User Mailbox.
Mail user
A mail user also has an Active Directory logon account, but
is configured with an email address outside your Exchange
organization. A mail user does not have a mailbox in your
Exchange database; instead they send and receive their
email via an external email address such as
recipient@gmail.com. A mail user is somewhat similar to
Contact, but with an Active Directory logon account. In
Exchange Server 2003 this recipient was called a Mail-
enabled User.
Mail contact
A mail contact contains information about people or
organizations that exist outside your Exchange
organization. Each mail contact has an external e-mail
address, for example, support@dell.com. Such objects
appear in the Global Address List (GAL), but have no logon
account. This recipient is also known as a Mail-enabled
Contact.
Mail-enabled universal distribution group (DL)
This is the classic distribution list. Create a mail-
enabled Active Directory distribution group so that users
can send messages to multiple recipients. To learn more,
launch the Exchange Management Console --> Recipient
Configuration, seek the 'New Distribution Group Wizard'.
Potential confusion: In Active Directory, a distribution
group means that the object does not have a security
context, therefore it has no associated Active Directory
account. In contrast, Exchange 2007, calls all mail-
enabled groups distribution groups. Exchange 2007
terminology does not differentiate between universal
distribution groups with, or without, a security context.
Confused? Just create a few objects, and the wizards will
magically disolve your mist of bewilderment.
Mail-enabled universal security group
The keyword, and the key difference from the above
recipient is - security. A mail-enabled Active Directory
security group object can be used to grant access
permissions to resources in Active Directory, and can also
be used to distribute messages.
Take care before you mail-enable a universal group. Guy
says these objects are designed to control permissions.
They obviously have a use, but to me they are disaster
waiting to happen.
Dynamic distribution group
A dynamic distribution group uses recipient filters and
conditions to derive its membership at the time messages
are sent. This an excellent type of distribution group,
therefore, don't miss a chance to investigate and to deploy
them rather than static groups.
This recipient type was (is) also known as a query-based
distribution group. One factor that makes this recipient
even better is that senders must be authenticated in
Exchange 2007. The only downside is the performance hit
placed on the Global Catalog server when determining
dynamic group membership.
Mail forest contact (Exotic and rare)
A mail contact that represents a recipient object from
another forest. Mail forest contacts are created by
Microsoft Identity Integration Server (MIIS)
synchronization.
Linked mailbox (Uncommon)
A mailbox that is assigned to an individual user in a
separate, trusted forest.
Please note Mail forest contacts are read-only recipient
objects that are updated only through MIIS. You cannot
modify a mail forest contact by using the Exchange
Management Console or Shell.
Shared mailbox
A mailbox that is not primarily associated with a single
user and is generally configured to allow logon access for
multiple users.
Legacy mailbox
A mailbox that resides on a server running Exchange Server
2003 or Exchange 2000 Server.
Room mailbox (Resource object)
This is the classic resource mailbox which you assign to a
meeting location, such as a conference center, or training
room. Users can include Room mailboxes as resources in
meeting requests.
Equipment mailbox (Resource object)
A resource mailbox that is assigned to a non-location
specific resource, such as a laptop, projector, or even a
company car. Equipment mailboxes can be included as
resources in meeting requests, providing a simple and
efficient way for users to use resources.
Mail-enabled public folder
An Exchange public folder that is configured to receive
messages.
Microsoft Exchange Recipient
The Microsoft Exchange recipient is a special recipient
object that provides a unified and well-known message
sender that differentiates system-generated messages from
other messages. It replaces the 'System Administrator'
sender that was used for system-generated messages in
Exchange Server 2003.
Mail-enabled non-universal group (Phased out)
A mail-enabled Active Directory global or local group
object. Mail-enabled non-universal groups are de-
emphasized in Exchange 2007 and can exist only if they were
migrated from previous versions of Exchange. You cannot use
Exchange 2007 to create new non-universal distribution
groups.
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