Microsoft Exchange Definitions

This glossary explains the meaning of key words and phrases that information technology (IT) and business professionals use when discussing Microsoft Exchange Server and related software products. You can find additional definitions by visiting or using the search box below.

  • A


    In a Windows environment, ArchiveSink is code that is activated through a defined trigger, such as the receipt of a new e-mail message, in order to archive messages coming in and out of an Exchange 2000 Server.

  • Automatic Private IP Addressing (APIPA)

    Automatic Private IP Addressing (APIPA) is a feature of Windows-based operating systems (included in Windows 98, ME, 2000, and XP) that enables a computer to automatically assign itself an IP address when there is no Dynamic Host Configuration Protocol (DHCP) server available to perform that function.

  • B

    backscatter spam

    Backscatter spam, also called misdirected bounce spam or NDR spam, is a strategy for sending unsolicited email messages that takes advantage of the fact that certain types of mail transfer agent (MTA) programs return the entire message to the sender when a recipient's email address is invalid.

  • bacn

    Bacn (pronounced as "bacon") is Internet slang for email that a user wants to read, but not right away. (Continued...)

  • blackhole list (blacklist)

    A blackhole list, sometimes simply referred to as a blacklist, is the publication of a group of ISP addresses known to be sources of spam, a type of e-mail more formally known as unsolicited commercial e-mail (UCE).

  • bounce email (bounce mail)

    Bounce e-mail (sometimes referred to as bounce mail) is electronic mail that is returned to the sender because it cannot be delivered for some reason.

  • C

    Client Access Server (CAS)

    The Client Access Server (CAS) is a server role for end user connectivity within the Exchange environment.

  • cluster

    In a computer system, a cluster is a group of servers and other resources that act like a single system and enable high availability and, in some cases, load balancing and parallel processing.

  • configuration

    Generally, a configuration is the arrangement - or the process of making the arrangement - of the parts that make up a whole.

  • corporate email policy

    A corporate email policy is a form of management that outlines how employees can use email and other electronic communication tools, such as instant messaging, in a corporate environment. The policy sets guidelines for what is deemed acceptable use and unacceptable use.

  • cutover migration

    The cutover Exchange migration process transfers data and mailboxes from one Exchange server to another in a single batch. Related user accounts are then administered in Office 365.

  • D

    database availability group (DAG)

    A database availability group (DAG) is a high availability (HA) and data recovery feature of Exchange Server 2010. 

  • discovery mailbox

    A discovery mailbox is used to perform e-discovery searches for Exchange Server and Exchange Online environments.

  • distribution list

    In e-mail applications, a distribution list is a group of mail recipients that is addressed as a single recipient.

  • E

    e-mail (electronic mail or email)

    E-mail (electronic mail) is the exchange of computer-stored messages by telecommunication.