U

Uniform Resource Identifier (URI)

A generic term for all types of addresses that refer to objects on the World Wide Web and private networks.

Uniform Resource Locator (URL)

An addressing method used to identify Internet servers and documents.

universal Inbox

A single folder or service that receives incoming items from all outside sources and of all types, such as e-mail, voice mail, faxes, pages, etc.

URL

See Uniform Resource Locator (URL).

Usenet

A network within the Internet that is composed of numerous servers containing information on a variety of topics. Each organized topic is called a newsgroup.

user object

An object in Active Directory that is associated with a person on the network. Users can be mailbox-enabled or mail-enabled in Exchange Server 2003.

UUENCODE

Stands for UNIX-to-UNIX Encode, and is a protocol used to encode binary information within mail messages. UUENCODE is older than MIME. See also Multipurpose Internet Mail Extensions (MIME.)