Exchange recipients are used to send and receive exchange mail, Active directory object or resources that send and receive messages are called Exchange recipient (like User object and Group object in Active Directory) in Exchange 2010 environment different types of Exchange recipient available and each recipient type is represented by a unique features
Most command recipient types
User
Group
Contact
Exchange 2010 recipient types
Dynamic distribution group
Equipment mailbox
Legacy mailbox
Linked mailbox
Mail contact
Mail forest contact
Mail user
Mail-enabled non-universal group
Mail-enabled public folder
Mail-enabled universal distribution group
Mail-enabled universal security group
Microsoft Exchange recipient
Room mailbox
Shared mailbox
User mailbox
Remote mailbox (New recipient type in Exchange 2010)
Linked user (New recipient type in Exchange 2010)